1 /* Target-struct-independent code to start (run) and stop an inferior
4 Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
5 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
6 2008, 2009 Free Software Foundation, Inc.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #include "gdb_string.h"
29 #include "exceptions.h"
30 #include "breakpoint.h"
34 #include "cli/cli-script.h"
36 #include "gdbthread.h"
48 #include "gdb_assert.h"
49 #include "mi/mi-common.h"
50 #include "event-top.h"
53 /* Prototypes for local functions */
55 static void signals_info (char *, int);
57 static void handle_command (char *, int);
59 static void sig_print_info (enum target_signal
);
61 static void sig_print_header (void);
63 static void resume_cleanups (void *);
65 static int hook_stop_stub (void *);
67 static int restore_selected_frame (void *);
69 static void build_infrun (void);
71 static int follow_fork (void);
73 static void set_schedlock_func (char *args
, int from_tty
,
74 struct cmd_list_element
*c
);
76 static int currently_stepping (struct thread_info
*tp
);
78 static int currently_stepping_or_nexting_callback (struct thread_info
*tp
,
81 static void xdb_handle_command (char *args
, int from_tty
);
83 static int prepare_to_proceed (int);
85 void _initialize_infrun (void);
87 void nullify_last_target_wait_ptid (void);
89 /* When set, stop the 'step' command if we enter a function which has
90 no line number information. The normal behavior is that we step
91 over such function. */
92 int step_stop_if_no_debug
= 0;
94 show_step_stop_if_no_debug (struct ui_file
*file
, int from_tty
,
95 struct cmd_list_element
*c
, const char *value
)
97 fprintf_filtered (file
, _("Mode of the step operation is %s.\n"), value
);
100 /* In asynchronous mode, but simulating synchronous execution. */
102 int sync_execution
= 0;
104 /* wait_for_inferior and normal_stop use this to notify the user
105 when the inferior stopped in a different thread than it had been
108 static ptid_t previous_inferior_ptid
;
110 int debug_displaced
= 0;
112 show_debug_displaced (struct ui_file
*file
, int from_tty
,
113 struct cmd_list_element
*c
, const char *value
)
115 fprintf_filtered (file
, _("Displace stepping debugging is %s.\n"), value
);
118 static int debug_infrun
= 0;
120 show_debug_infrun (struct ui_file
*file
, int from_tty
,
121 struct cmd_list_element
*c
, const char *value
)
123 fprintf_filtered (file
, _("Inferior debugging is %s.\n"), value
);
126 /* If the program uses ELF-style shared libraries, then calls to
127 functions in shared libraries go through stubs, which live in a
128 table called the PLT (Procedure Linkage Table). The first time the
129 function is called, the stub sends control to the dynamic linker,
130 which looks up the function's real address, patches the stub so
131 that future calls will go directly to the function, and then passes
132 control to the function.
134 If we are stepping at the source level, we don't want to see any of
135 this --- we just want to skip over the stub and the dynamic linker.
136 The simple approach is to single-step until control leaves the
139 However, on some systems (e.g., Red Hat's 5.2 distribution) the
140 dynamic linker calls functions in the shared C library, so you
141 can't tell from the PC alone whether the dynamic linker is still
142 running. In this case, we use a step-resume breakpoint to get us
143 past the dynamic linker, as if we were using "next" to step over a
146 in_solib_dynsym_resolve_code() says whether we're in the dynamic
147 linker code or not. Normally, this means we single-step. However,
148 if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an
149 address where we can place a step-resume breakpoint to get past the
150 linker's symbol resolution function.
152 in_solib_dynsym_resolve_code() can generally be implemented in a
153 pretty portable way, by comparing the PC against the address ranges
154 of the dynamic linker's sections.
156 SKIP_SOLIB_RESOLVER is generally going to be system-specific, since
157 it depends on internal details of the dynamic linker. It's usually
158 not too hard to figure out where to put a breakpoint, but it
159 certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of
160 sanity checking. If it can't figure things out, returning zero and
161 getting the (possibly confusing) stepping behavior is better than
162 signalling an error, which will obscure the change in the
165 /* This function returns TRUE if pc is the address of an instruction
166 that lies within the dynamic linker (such as the event hook, or the
169 This function must be used only when a dynamic linker event has
170 been caught, and the inferior is being stepped out of the hook, or
171 undefined results are guaranteed. */
173 #ifndef SOLIB_IN_DYNAMIC_LINKER
174 #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0
178 /* Convert the #defines into values. This is temporary until wfi control
179 flow is completely sorted out. */
181 #ifndef CANNOT_STEP_HW_WATCHPOINTS
182 #define CANNOT_STEP_HW_WATCHPOINTS 0
184 #undef CANNOT_STEP_HW_WATCHPOINTS
185 #define CANNOT_STEP_HW_WATCHPOINTS 1
188 /* Tables of how to react to signals; the user sets them. */
190 static unsigned char *signal_stop
;
191 static unsigned char *signal_print
;
192 static unsigned char *signal_program
;
194 #define SET_SIGS(nsigs,sigs,flags) \
196 int signum = (nsigs); \
197 while (signum-- > 0) \
198 if ((sigs)[signum]) \
199 (flags)[signum] = 1; \
202 #define UNSET_SIGS(nsigs,sigs,flags) \
204 int signum = (nsigs); \
205 while (signum-- > 0) \
206 if ((sigs)[signum]) \
207 (flags)[signum] = 0; \
210 /* Value to pass to target_resume() to cause all threads to resume */
212 #define RESUME_ALL (pid_to_ptid (-1))
214 /* Command list pointer for the "stop" placeholder. */
216 static struct cmd_list_element
*stop_command
;
218 /* Function inferior was in as of last step command. */
220 static struct symbol
*step_start_function
;
222 /* Nonzero if we want to give control to the user when we're notified
223 of shared library events by the dynamic linker. */
224 static int stop_on_solib_events
;
226 show_stop_on_solib_events (struct ui_file
*file
, int from_tty
,
227 struct cmd_list_element
*c
, const char *value
)
229 fprintf_filtered (file
, _("Stopping for shared library events is %s.\n"),
233 /* Nonzero means expecting a trace trap
234 and should stop the inferior and return silently when it happens. */
238 /* Save register contents here when executing a "finish" command or are
239 about to pop a stack dummy frame, if-and-only-if proceed_to_finish is set.
240 Thus this contains the return value from the called function (assuming
241 values are returned in a register). */
243 struct regcache
*stop_registers
;
245 /* Nonzero after stop if current stack frame should be printed. */
247 static int stop_print_frame
;
249 /* This is a cached copy of the pid/waitstatus of the last event
250 returned by target_wait()/deprecated_target_wait_hook(). This
251 information is returned by get_last_target_status(). */
252 static ptid_t target_last_wait_ptid
;
253 static struct target_waitstatus target_last_waitstatus
;
255 static void context_switch (ptid_t ptid
);
257 void init_thread_stepping_state (struct thread_info
*tss
);
259 void init_infwait_state (void);
261 static const char follow_fork_mode_child
[] = "child";
262 static const char follow_fork_mode_parent
[] = "parent";
264 static const char *follow_fork_mode_kind_names
[] = {
265 follow_fork_mode_child
,
266 follow_fork_mode_parent
,
270 static const char *follow_fork_mode_string
= follow_fork_mode_parent
;
272 show_follow_fork_mode_string (struct ui_file
*file
, int from_tty
,
273 struct cmd_list_element
*c
, const char *value
)
275 fprintf_filtered (file
, _("\
276 Debugger response to a program call of fork or vfork is \"%s\".\n"),
281 /* Tell the target to follow the fork we're stopped at. Returns true
282 if the inferior should be resumed; false, if the target for some
283 reason decided it's best not to resume. */
288 int follow_child
= (follow_fork_mode_string
== follow_fork_mode_child
);
289 int should_resume
= 1;
290 struct thread_info
*tp
;
292 /* Copy user stepping state to the new inferior thread. FIXME: the
293 followed fork child thread should have a copy of most of the
294 parent thread structure's run control related fields, not just these.
295 Initialized to avoid "may be used uninitialized" warnings from gcc. */
296 struct breakpoint
*step_resume_breakpoint
= NULL
;
297 CORE_ADDR step_range_start
= 0;
298 CORE_ADDR step_range_end
= 0;
299 struct frame_id step_frame_id
= { 0 };
304 struct target_waitstatus wait_status
;
306 /* Get the last target status returned by target_wait(). */
307 get_last_target_status (&wait_ptid
, &wait_status
);
309 /* If not stopped at a fork event, then there's nothing else to
311 if (wait_status
.kind
!= TARGET_WAITKIND_FORKED
312 && wait_status
.kind
!= TARGET_WAITKIND_VFORKED
)
315 /* Check if we switched over from WAIT_PTID, since the event was
317 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
318 && !ptid_equal (inferior_ptid
, wait_ptid
))
320 /* We did. Switch back to WAIT_PTID thread, to tell the
321 target to follow it (in either direction). We'll
322 afterwards refuse to resume, and inform the user what
324 switch_to_thread (wait_ptid
);
329 tp
= inferior_thread ();
331 /* If there were any forks/vforks that were caught and are now to be
332 followed, then do so now. */
333 switch (tp
->pending_follow
.kind
)
335 case TARGET_WAITKIND_FORKED
:
336 case TARGET_WAITKIND_VFORKED
:
338 ptid_t parent
, child
;
340 /* If the user did a next/step, etc, over a fork call,
341 preserve the stepping state in the fork child. */
342 if (follow_child
&& should_resume
)
344 step_resume_breakpoint
345 = clone_momentary_breakpoint (tp
->step_resume_breakpoint
);
346 step_range_start
= tp
->step_range_start
;
347 step_range_end
= tp
->step_range_end
;
348 step_frame_id
= tp
->step_frame_id
;
350 /* For now, delete the parent's sr breakpoint, otherwise,
351 parent/child sr breakpoints are considered duplicates,
352 and the child version will not be installed. Remove
353 this when the breakpoints module becomes aware of
354 inferiors and address spaces. */
355 delete_step_resume_breakpoint (tp
);
356 tp
->step_range_start
= 0;
357 tp
->step_range_end
= 0;
358 tp
->step_frame_id
= null_frame_id
;
361 parent
= inferior_ptid
;
362 child
= tp
->pending_follow
.value
.related_pid
;
364 /* Tell the target to do whatever is necessary to follow
365 either parent or child. */
366 if (target_follow_fork (follow_child
))
368 /* Target refused to follow, or there's some other reason
369 we shouldn't resume. */
374 /* This pending follow fork event is now handled, one way
375 or another. The previous selected thread may be gone
376 from the lists by now, but if it is still around, need
377 to clear the pending follow request. */
378 tp
= find_thread_ptid (parent
);
380 tp
->pending_follow
.kind
= TARGET_WAITKIND_SPURIOUS
;
382 /* This makes sure we don't try to apply the "Switched
383 over from WAIT_PID" logic above. */
384 nullify_last_target_wait_ptid ();
386 /* If we followed the child, switch to it... */
389 switch_to_thread (child
);
391 /* ... and preserve the stepping state, in case the
392 user was stepping over the fork call. */
395 tp
= inferior_thread ();
396 tp
->step_resume_breakpoint
= step_resume_breakpoint
;
397 tp
->step_range_start
= step_range_start
;
398 tp
->step_range_end
= step_range_end
;
399 tp
->step_frame_id
= step_frame_id
;
403 /* If we get here, it was because we're trying to
404 resume from a fork catchpoint, but, the user
405 has switched threads away from the thread that
406 forked. In that case, the resume command
407 issued is most likely not applicable to the
408 child, so just warn, and refuse to resume. */
410 Not resuming: switched threads before following fork child.\n"));
413 /* Reset breakpoints in the child as appropriate. */
414 follow_inferior_reset_breakpoints ();
417 switch_to_thread (parent
);
421 case TARGET_WAITKIND_SPURIOUS
:
422 /* Nothing to follow. */
425 internal_error (__FILE__
, __LINE__
,
426 "Unexpected pending_follow.kind %d\n",
427 tp
->pending_follow
.kind
);
431 return should_resume
;
435 follow_inferior_reset_breakpoints (void)
437 struct thread_info
*tp
= inferior_thread ();
439 /* Was there a step_resume breakpoint? (There was if the user
440 did a "next" at the fork() call.) If so, explicitly reset its
443 step_resumes are a form of bp that are made to be per-thread.
444 Since we created the step_resume bp when the parent process
445 was being debugged, and now are switching to the child process,
446 from the breakpoint package's viewpoint, that's a switch of
447 "threads". We must update the bp's notion of which thread
448 it is for, or it'll be ignored when it triggers. */
450 if (tp
->step_resume_breakpoint
)
451 breakpoint_re_set_thread (tp
->step_resume_breakpoint
);
453 /* Reinsert all breakpoints in the child. The user may have set
454 breakpoints after catching the fork, in which case those
455 were never set in the child, but only in the parent. This makes
456 sure the inserted breakpoints match the breakpoint list. */
458 breakpoint_re_set ();
459 insert_breakpoints ();
462 /* EXECD_PATHNAME is assumed to be non-NULL. */
465 follow_exec (ptid_t pid
, char *execd_pathname
)
467 struct target_ops
*tgt
;
468 struct thread_info
*th
= inferior_thread ();
470 /* This is an exec event that we actually wish to pay attention to.
471 Refresh our symbol table to the newly exec'd program, remove any
474 If there are breakpoints, they aren't really inserted now,
475 since the exec() transformed our inferior into a fresh set
478 We want to preserve symbolic breakpoints on the list, since
479 we have hopes that they can be reset after the new a.out's
480 symbol table is read.
482 However, any "raw" breakpoints must be removed from the list
483 (e.g., the solib bp's), since their address is probably invalid
486 And, we DON'T want to call delete_breakpoints() here, since
487 that may write the bp's "shadow contents" (the instruction
488 value that was overwritten witha TRAP instruction). Since
489 we now have a new a.out, those shadow contents aren't valid. */
490 update_breakpoints_after_exec ();
492 /* If there was one, it's gone now. We cannot truly step-to-next
493 statement through an exec(). */
494 th
->step_resume_breakpoint
= NULL
;
495 th
->step_range_start
= 0;
496 th
->step_range_end
= 0;
498 /* The target reports the exec event to the main thread, even if
499 some other thread does the exec, and even if the main thread was
500 already stopped --- if debugging in non-stop mode, it's possible
501 the user had the main thread held stopped in the previous image
502 --- release it now. This is the same behavior as step-over-exec
503 with scheduler-locking on in all-stop mode. */
504 th
->stop_requested
= 0;
506 /* What is this a.out's name? */
507 printf_unfiltered (_("Executing new program: %s\n"), execd_pathname
);
509 /* We've followed the inferior through an exec. Therefore, the
510 inferior has essentially been killed & reborn. */
512 gdb_flush (gdb_stdout
);
514 breakpoint_init_inferior (inf_execd
);
516 if (gdb_sysroot
&& *gdb_sysroot
)
518 char *name
= alloca (strlen (gdb_sysroot
)
519 + strlen (execd_pathname
)
521 strcpy (name
, gdb_sysroot
);
522 strcat (name
, execd_pathname
);
523 execd_pathname
= name
;
526 /* That a.out is now the one to use. */
527 exec_file_attach (execd_pathname
, 0);
529 /* Reset the shared library package. This ensures that we get a
530 shlib event when the child reaches "_start", at which point the
531 dld will have had a chance to initialize the child. */
532 /* Also, loading a symbol file below may trigger symbol lookups, and
533 we don't want those to be satisfied by the libraries of the
534 previous incarnation of this process. */
535 no_shared_libraries (NULL
, 0);
537 /* Load the main file's symbols. */
538 symbol_file_add_main (execd_pathname
, 0);
540 #ifdef SOLIB_CREATE_INFERIOR_HOOK
541 SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid
));
543 solib_create_inferior_hook ();
546 /* Reinsert all breakpoints. (Those which were symbolic have
547 been reset to the proper address in the new a.out, thanks
548 to symbol_file_command...) */
549 insert_breakpoints ();
551 /* The next resume of this inferior should bring it to the shlib
552 startup breakpoints. (If the user had also set bp's on
553 "main" from the old (parent) process, then they'll auto-
554 matically get reset there in the new process.) */
557 /* Non-zero if we just simulating a single-step. This is needed
558 because we cannot remove the breakpoints in the inferior process
559 until after the `wait' in `wait_for_inferior'. */
560 static int singlestep_breakpoints_inserted_p
= 0;
562 /* The thread we inserted single-step breakpoints for. */
563 static ptid_t singlestep_ptid
;
565 /* PC when we started this single-step. */
566 static CORE_ADDR singlestep_pc
;
568 /* If another thread hit the singlestep breakpoint, we save the original
569 thread here so that we can resume single-stepping it later. */
570 static ptid_t saved_singlestep_ptid
;
571 static int stepping_past_singlestep_breakpoint
;
573 /* If not equal to null_ptid, this means that after stepping over breakpoint
574 is finished, we need to switch to deferred_step_ptid, and step it.
576 The use case is when one thread has hit a breakpoint, and then the user
577 has switched to another thread and issued 'step'. We need to step over
578 breakpoint in the thread which hit the breakpoint, but then continue
579 stepping the thread user has selected. */
580 static ptid_t deferred_step_ptid
;
582 /* Displaced stepping. */
584 /* In non-stop debugging mode, we must take special care to manage
585 breakpoints properly; in particular, the traditional strategy for
586 stepping a thread past a breakpoint it has hit is unsuitable.
587 'Displaced stepping' is a tactic for stepping one thread past a
588 breakpoint it has hit while ensuring that other threads running
589 concurrently will hit the breakpoint as they should.
591 The traditional way to step a thread T off a breakpoint in a
592 multi-threaded program in all-stop mode is as follows:
594 a0) Initially, all threads are stopped, and breakpoints are not
596 a1) We single-step T, leaving breakpoints uninserted.
597 a2) We insert breakpoints, and resume all threads.
599 In non-stop debugging, however, this strategy is unsuitable: we
600 don't want to have to stop all threads in the system in order to
601 continue or step T past a breakpoint. Instead, we use displaced
604 n0) Initially, T is stopped, other threads are running, and
605 breakpoints are inserted.
606 n1) We copy the instruction "under" the breakpoint to a separate
607 location, outside the main code stream, making any adjustments
608 to the instruction, register, and memory state as directed by
610 n2) We single-step T over the instruction at its new location.
611 n3) We adjust the resulting register and memory state as directed
612 by T's architecture. This includes resetting T's PC to point
613 back into the main instruction stream.
616 This approach depends on the following gdbarch methods:
618 - gdbarch_max_insn_length and gdbarch_displaced_step_location
619 indicate where to copy the instruction, and how much space must
620 be reserved there. We use these in step n1.
622 - gdbarch_displaced_step_copy_insn copies a instruction to a new
623 address, and makes any necessary adjustments to the instruction,
624 register contents, and memory. We use this in step n1.
626 - gdbarch_displaced_step_fixup adjusts registers and memory after
627 we have successfuly single-stepped the instruction, to yield the
628 same effect the instruction would have had if we had executed it
629 at its original address. We use this in step n3.
631 - gdbarch_displaced_step_free_closure provides cleanup.
633 The gdbarch_displaced_step_copy_insn and
634 gdbarch_displaced_step_fixup functions must be written so that
635 copying an instruction with gdbarch_displaced_step_copy_insn,
636 single-stepping across the copied instruction, and then applying
637 gdbarch_displaced_insn_fixup should have the same effects on the
638 thread's memory and registers as stepping the instruction in place
639 would have. Exactly which responsibilities fall to the copy and
640 which fall to the fixup is up to the author of those functions.
642 See the comments in gdbarch.sh for details.
644 Note that displaced stepping and software single-step cannot
645 currently be used in combination, although with some care I think
646 they could be made to. Software single-step works by placing
647 breakpoints on all possible subsequent instructions; if the
648 displaced instruction is a PC-relative jump, those breakpoints
649 could fall in very strange places --- on pages that aren't
650 executable, or at addresses that are not proper instruction
651 boundaries. (We do generally let other threads run while we wait
652 to hit the software single-step breakpoint, and they might
653 encounter such a corrupted instruction.) One way to work around
654 this would be to have gdbarch_displaced_step_copy_insn fully
655 simulate the effect of PC-relative instructions (and return NULL)
656 on architectures that use software single-stepping.
658 In non-stop mode, we can have independent and simultaneous step
659 requests, so more than one thread may need to simultaneously step
660 over a breakpoint. The current implementation assumes there is
661 only one scratch space per process. In this case, we have to
662 serialize access to the scratch space. If thread A wants to step
663 over a breakpoint, but we are currently waiting for some other
664 thread to complete a displaced step, we leave thread A stopped and
665 place it in the displaced_step_request_queue. Whenever a displaced
666 step finishes, we pick the next thread in the queue and start a new
667 displaced step operation on it. See displaced_step_prepare and
668 displaced_step_fixup for details. */
670 /* If this is not null_ptid, this is the thread carrying out a
671 displaced single-step. This thread's state will require fixing up
672 once it has completed its step. */
673 static ptid_t displaced_step_ptid
;
675 struct displaced_step_request
678 struct displaced_step_request
*next
;
681 /* A queue of pending displaced stepping requests. */
682 struct displaced_step_request
*displaced_step_request_queue
;
684 /* The architecture the thread had when we stepped it. */
685 static struct gdbarch
*displaced_step_gdbarch
;
687 /* The closure provided gdbarch_displaced_step_copy_insn, to be used
688 for post-step cleanup. */
689 static struct displaced_step_closure
*displaced_step_closure
;
691 /* The address of the original instruction, and the copy we made. */
692 static CORE_ADDR displaced_step_original
, displaced_step_copy
;
694 /* Saved contents of copy area. */
695 static gdb_byte
*displaced_step_saved_copy
;
697 /* Enum strings for "set|show displaced-stepping". */
699 static const char can_use_displaced_stepping_auto
[] = "auto";
700 static const char can_use_displaced_stepping_on
[] = "on";
701 static const char can_use_displaced_stepping_off
[] = "off";
702 static const char *can_use_displaced_stepping_enum
[] =
704 can_use_displaced_stepping_auto
,
705 can_use_displaced_stepping_on
,
706 can_use_displaced_stepping_off
,
710 /* If ON, and the architecture supports it, GDB will use displaced
711 stepping to step over breakpoints. If OFF, or if the architecture
712 doesn't support it, GDB will instead use the traditional
713 hold-and-step approach. If AUTO (which is the default), GDB will
714 decide which technique to use to step over breakpoints depending on
715 which of all-stop or non-stop mode is active --- displaced stepping
716 in non-stop mode; hold-and-step in all-stop mode. */
718 static const char *can_use_displaced_stepping
=
719 can_use_displaced_stepping_auto
;
722 show_can_use_displaced_stepping (struct ui_file
*file
, int from_tty
,
723 struct cmd_list_element
*c
,
726 if (can_use_displaced_stepping
== can_use_displaced_stepping_auto
)
727 fprintf_filtered (file
, _("\
728 Debugger's willingness to use displaced stepping to step over \
729 breakpoints is %s (currently %s).\n"),
730 value
, non_stop
? "on" : "off");
732 fprintf_filtered (file
, _("\
733 Debugger's willingness to use displaced stepping to step over \
734 breakpoints is %s.\n"), value
);
737 /* Return non-zero if displaced stepping can/should be used to step
741 use_displaced_stepping (struct gdbarch
*gdbarch
)
743 return (((can_use_displaced_stepping
== can_use_displaced_stepping_auto
745 || can_use_displaced_stepping
== can_use_displaced_stepping_on
)
746 && gdbarch_displaced_step_copy_insn_p (gdbarch
)
750 /* Clean out any stray displaced stepping state. */
752 displaced_step_clear (void)
754 /* Indicate that there is no cleanup pending. */
755 displaced_step_ptid
= null_ptid
;
757 if (displaced_step_closure
)
759 gdbarch_displaced_step_free_closure (displaced_step_gdbarch
,
760 displaced_step_closure
);
761 displaced_step_closure
= NULL
;
766 displaced_step_clear_cleanup (void *ignore
)
768 displaced_step_clear ();
771 /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */
773 displaced_step_dump_bytes (struct ui_file
*file
,
779 for (i
= 0; i
< len
; i
++)
780 fprintf_unfiltered (file
, "%02x ", buf
[i
]);
781 fputs_unfiltered ("\n", file
);
784 /* Prepare to single-step, using displaced stepping.
786 Note that we cannot use displaced stepping when we have a signal to
787 deliver. If we have a signal to deliver and an instruction to step
788 over, then after the step, there will be no indication from the
789 target whether the thread entered a signal handler or ignored the
790 signal and stepped over the instruction successfully --- both cases
791 result in a simple SIGTRAP. In the first case we mustn't do a
792 fixup, and in the second case we must --- but we can't tell which.
793 Comments in the code for 'random signals' in handle_inferior_event
794 explain how we handle this case instead.
796 Returns 1 if preparing was successful -- this thread is going to be
797 stepped now; or 0 if displaced stepping this thread got queued. */
799 displaced_step_prepare (ptid_t ptid
)
801 struct cleanup
*old_cleanups
, *ignore_cleanups
;
802 struct regcache
*regcache
= get_thread_regcache (ptid
);
803 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
804 CORE_ADDR original
, copy
;
806 struct displaced_step_closure
*closure
;
808 /* We should never reach this function if the architecture does not
809 support displaced stepping. */
810 gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch
));
812 /* For the first cut, we're displaced stepping one thread at a
815 if (!ptid_equal (displaced_step_ptid
, null_ptid
))
817 /* Already waiting for a displaced step to finish. Defer this
818 request and place in queue. */
819 struct displaced_step_request
*req
, *new_req
;
822 fprintf_unfiltered (gdb_stdlog
,
823 "displaced: defering step of %s\n",
824 target_pid_to_str (ptid
));
826 new_req
= xmalloc (sizeof (*new_req
));
827 new_req
->ptid
= ptid
;
828 new_req
->next
= NULL
;
830 if (displaced_step_request_queue
)
832 for (req
= displaced_step_request_queue
;
839 displaced_step_request_queue
= new_req
;
846 fprintf_unfiltered (gdb_stdlog
,
847 "displaced: stepping %s now\n",
848 target_pid_to_str (ptid
));
851 displaced_step_clear ();
853 old_cleanups
= save_inferior_ptid ();
854 inferior_ptid
= ptid
;
856 original
= regcache_read_pc (regcache
);
858 copy
= gdbarch_displaced_step_location (gdbarch
);
859 len
= gdbarch_max_insn_length (gdbarch
);
861 /* Save the original contents of the copy area. */
862 displaced_step_saved_copy
= xmalloc (len
);
863 ignore_cleanups
= make_cleanup (free_current_contents
,
864 &displaced_step_saved_copy
);
865 read_memory (copy
, displaced_step_saved_copy
, len
);
868 fprintf_unfiltered (gdb_stdlog
, "displaced: saved 0x%s: ",
870 displaced_step_dump_bytes (gdb_stdlog
, displaced_step_saved_copy
, len
);
873 closure
= gdbarch_displaced_step_copy_insn (gdbarch
,
874 original
, copy
, regcache
);
876 /* We don't support the fully-simulated case at present. */
877 gdb_assert (closure
);
879 /* Save the information we need to fix things up if the step
881 displaced_step_ptid
= ptid
;
882 displaced_step_gdbarch
= gdbarch
;
883 displaced_step_closure
= closure
;
884 displaced_step_original
= original
;
885 displaced_step_copy
= copy
;
887 make_cleanup (displaced_step_clear_cleanup
, 0);
889 /* Resume execution at the copy. */
890 regcache_write_pc (regcache
, copy
);
892 discard_cleanups (ignore_cleanups
);
894 do_cleanups (old_cleanups
);
897 fprintf_unfiltered (gdb_stdlog
, "displaced: displaced pc to 0x%s\n",
904 write_memory_ptid (ptid_t ptid
, CORE_ADDR memaddr
, const gdb_byte
*myaddr
, int len
)
906 struct cleanup
*ptid_cleanup
= save_inferior_ptid ();
907 inferior_ptid
= ptid
;
908 write_memory (memaddr
, myaddr
, len
);
909 do_cleanups (ptid_cleanup
);
913 displaced_step_fixup (ptid_t event_ptid
, enum target_signal signal
)
915 struct cleanup
*old_cleanups
;
917 /* Was this event for the pid we displaced? */
918 if (ptid_equal (displaced_step_ptid
, null_ptid
)
919 || ! ptid_equal (displaced_step_ptid
, event_ptid
))
922 old_cleanups
= make_cleanup (displaced_step_clear_cleanup
, 0);
924 /* Restore the contents of the copy area. */
926 ULONGEST len
= gdbarch_max_insn_length (displaced_step_gdbarch
);
927 write_memory_ptid (displaced_step_ptid
, displaced_step_copy
,
928 displaced_step_saved_copy
, len
);
930 fprintf_unfiltered (gdb_stdlog
, "displaced: restored 0x%s\n",
931 paddr_nz (displaced_step_copy
));
934 /* Did the instruction complete successfully? */
935 if (signal
== TARGET_SIGNAL_TRAP
)
937 /* Fix up the resulting state. */
938 gdbarch_displaced_step_fixup (displaced_step_gdbarch
,
939 displaced_step_closure
,
940 displaced_step_original
,
942 get_thread_regcache (displaced_step_ptid
));
946 /* Since the instruction didn't complete, all we can do is
948 struct regcache
*regcache
= get_thread_regcache (event_ptid
);
949 CORE_ADDR pc
= regcache_read_pc (regcache
);
950 pc
= displaced_step_original
+ (pc
- displaced_step_copy
);
951 regcache_write_pc (regcache
, pc
);
954 do_cleanups (old_cleanups
);
956 displaced_step_ptid
= null_ptid
;
958 /* Are there any pending displaced stepping requests? If so, run
960 while (displaced_step_request_queue
)
962 struct displaced_step_request
*head
;
966 head
= displaced_step_request_queue
;
968 displaced_step_request_queue
= head
->next
;
971 context_switch (ptid
);
973 actual_pc
= regcache_read_pc (get_thread_regcache (ptid
));
975 if (breakpoint_here_p (actual_pc
))
978 fprintf_unfiltered (gdb_stdlog
,
979 "displaced: stepping queued %s now\n",
980 target_pid_to_str (ptid
));
982 displaced_step_prepare (ptid
);
988 fprintf_unfiltered (gdb_stdlog
, "displaced: run 0x%s: ",
989 paddr_nz (actual_pc
));
990 read_memory (actual_pc
, buf
, sizeof (buf
));
991 displaced_step_dump_bytes (gdb_stdlog
, buf
, sizeof (buf
));
994 target_resume (ptid
, 1, TARGET_SIGNAL_0
);
996 /* Done, we're stepping a thread. */
1002 struct thread_info
*tp
= inferior_thread ();
1004 /* The breakpoint we were sitting under has since been
1006 tp
->trap_expected
= 0;
1008 /* Go back to what we were trying to do. */
1009 step
= currently_stepping (tp
);
1011 if (debug_displaced
)
1012 fprintf_unfiltered (gdb_stdlog
, "breakpoint is gone %s: step(%d)\n",
1013 target_pid_to_str (tp
->ptid
), step
);
1015 target_resume (ptid
, step
, TARGET_SIGNAL_0
);
1016 tp
->stop_signal
= TARGET_SIGNAL_0
;
1018 /* This request was discarded. See if there's any other
1019 thread waiting for its turn. */
1024 /* Update global variables holding ptids to hold NEW_PTID if they were
1025 holding OLD_PTID. */
1027 infrun_thread_ptid_changed (ptid_t old_ptid
, ptid_t new_ptid
)
1029 struct displaced_step_request
*it
;
1031 if (ptid_equal (inferior_ptid
, old_ptid
))
1032 inferior_ptid
= new_ptid
;
1034 if (ptid_equal (singlestep_ptid
, old_ptid
))
1035 singlestep_ptid
= new_ptid
;
1037 if (ptid_equal (displaced_step_ptid
, old_ptid
))
1038 displaced_step_ptid
= new_ptid
;
1040 if (ptid_equal (deferred_step_ptid
, old_ptid
))
1041 deferred_step_ptid
= new_ptid
;
1043 for (it
= displaced_step_request_queue
; it
; it
= it
->next
)
1044 if (ptid_equal (it
->ptid
, old_ptid
))
1045 it
->ptid
= new_ptid
;
1051 /* Things to clean up if we QUIT out of resume (). */
1053 resume_cleanups (void *ignore
)
1058 static const char schedlock_off
[] = "off";
1059 static const char schedlock_on
[] = "on";
1060 static const char schedlock_step
[] = "step";
1061 static const char *scheduler_enums
[] = {
1067 static const char *scheduler_mode
= schedlock_off
;
1069 show_scheduler_mode (struct ui_file
*file
, int from_tty
,
1070 struct cmd_list_element
*c
, const char *value
)
1072 fprintf_filtered (file
, _("\
1073 Mode for locking scheduler during execution is \"%s\".\n"),
1078 set_schedlock_func (char *args
, int from_tty
, struct cmd_list_element
*c
)
1080 if (!target_can_lock_scheduler
)
1082 scheduler_mode
= schedlock_off
;
1083 error (_("Target '%s' cannot support this command."), target_shortname
);
1087 /* True if execution commands resume all threads of all processes by
1088 default; otherwise, resume only threads of the current inferior
1090 int sched_multi
= 0;
1092 /* Try to setup for software single stepping over the specified location.
1093 Return 1 if target_resume() should use hardware single step.
1095 GDBARCH the current gdbarch.
1096 PC the location to step over. */
1099 maybe_software_singlestep (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
1103 if (gdbarch_software_single_step_p (gdbarch
)
1104 && gdbarch_software_single_step (gdbarch
, get_current_frame ()))
1107 /* Do not pull these breakpoints until after a `wait' in
1108 `wait_for_inferior' */
1109 singlestep_breakpoints_inserted_p
= 1;
1110 singlestep_ptid
= inferior_ptid
;
1116 /* Resume the inferior, but allow a QUIT. This is useful if the user
1117 wants to interrupt some lengthy single-stepping operation
1118 (for child processes, the SIGINT goes to the inferior, and so
1119 we get a SIGINT random_signal, but for remote debugging and perhaps
1120 other targets, that's not true).
1122 STEP nonzero if we should step (zero to continue instead).
1123 SIG is the signal to give the inferior (zero for none). */
1125 resume (int step
, enum target_signal sig
)
1127 int should_resume
= 1;
1128 struct cleanup
*old_cleanups
= make_cleanup (resume_cleanups
, 0);
1129 struct regcache
*regcache
= get_current_regcache ();
1130 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
1131 struct thread_info
*tp
= inferior_thread ();
1132 CORE_ADDR pc
= regcache_read_pc (regcache
);
1137 fprintf_unfiltered (gdb_stdlog
,
1138 "infrun: resume (step=%d, signal=%d), "
1139 "trap_expected=%d\n",
1140 step
, sig
, tp
->trap_expected
);
1142 /* Some targets (e.g. Solaris x86) have a kernel bug when stepping
1143 over an instruction that causes a page fault without triggering
1144 a hardware watchpoint. The kernel properly notices that it shouldn't
1145 stop, because the hardware watchpoint is not triggered, but it forgets
1146 the step request and continues the program normally.
1147 Work around the problem by removing hardware watchpoints if a step is
1148 requested, GDB will check for a hardware watchpoint trigger after the
1150 if (CANNOT_STEP_HW_WATCHPOINTS
&& step
)
1151 remove_hw_watchpoints ();
1154 /* Normally, by the time we reach `resume', the breakpoints are either
1155 removed or inserted, as appropriate. The exception is if we're sitting
1156 at a permanent breakpoint; we need to step over it, but permanent
1157 breakpoints can't be removed. So we have to test for it here. */
1158 if (breakpoint_here_p (pc
) == permanent_breakpoint_here
)
1160 if (gdbarch_skip_permanent_breakpoint_p (gdbarch
))
1161 gdbarch_skip_permanent_breakpoint (gdbarch
, regcache
);
1164 The program is stopped at a permanent breakpoint, but GDB does not know\n\
1165 how to step past a permanent breakpoint on this architecture. Try using\n\
1166 a command like `return' or `jump' to continue execution."));
1169 /* If enabled, step over breakpoints by executing a copy of the
1170 instruction at a different address.
1172 We can't use displaced stepping when we have a signal to deliver;
1173 the comments for displaced_step_prepare explain why. The
1174 comments in the handle_inferior event for dealing with 'random
1175 signals' explain what we do instead. */
1176 if (use_displaced_stepping (gdbarch
)
1177 && tp
->trap_expected
1178 && sig
== TARGET_SIGNAL_0
)
1180 if (!displaced_step_prepare (inferior_ptid
))
1182 /* Got placed in displaced stepping queue. Will be resumed
1183 later when all the currently queued displaced stepping
1184 requests finish. The thread is not executing at this point,
1185 and the call to set_executing will be made later. But we
1186 need to call set_running here, since from frontend point of view,
1187 the thread is running. */
1188 set_running (inferior_ptid
, 1);
1189 discard_cleanups (old_cleanups
);
1194 /* Do we need to do it the hard way, w/temp breakpoints? */
1196 step
= maybe_software_singlestep (gdbarch
, pc
);
1202 /* If STEP is set, it's a request to use hardware stepping
1203 facilities. But in that case, we should never
1204 use singlestep breakpoint. */
1205 gdb_assert (!(singlestep_breakpoints_inserted_p
&& step
));
1207 /* Decide the set of threads to ask the target to resume. Start
1208 by assuming everything will be resumed, than narrow the set
1209 by applying increasingly restricting conditions. */
1211 /* By default, resume all threads of all processes. */
1212 resume_ptid
= RESUME_ALL
;
1214 /* Maybe resume only all threads of the current process. */
1215 if (!sched_multi
&& target_supports_multi_process ())
1217 resume_ptid
= pid_to_ptid (ptid_get_pid (inferior_ptid
));
1220 /* Maybe resume a single thread after all. */
1221 if (singlestep_breakpoints_inserted_p
1222 && stepping_past_singlestep_breakpoint
)
1224 /* The situation here is as follows. In thread T1 we wanted to
1225 single-step. Lacking hardware single-stepping we've
1226 set breakpoint at the PC of the next instruction -- call it
1227 P. After resuming, we've hit that breakpoint in thread T2.
1228 Now we've removed original breakpoint, inserted breakpoint
1229 at P+1, and try to step to advance T2 past breakpoint.
1230 We need to step only T2, as if T1 is allowed to freely run,
1231 it can run past P, and if other threads are allowed to run,
1232 they can hit breakpoint at P+1, and nested hits of single-step
1233 breakpoints is not something we'd want -- that's complicated
1234 to support, and has no value. */
1235 resume_ptid
= inferior_ptid
;
1237 else if ((step
|| singlestep_breakpoints_inserted_p
)
1238 && tp
->trap_expected
)
1240 /* We're allowing a thread to run past a breakpoint it has
1241 hit, by single-stepping the thread with the breakpoint
1242 removed. In which case, we need to single-step only this
1243 thread, and keep others stopped, as they can miss this
1244 breakpoint if allowed to run.
1246 The current code actually removes all breakpoints when
1247 doing this, not just the one being stepped over, so if we
1248 let other threads run, we can actually miss any
1249 breakpoint, not just the one at PC. */
1250 resume_ptid
= inferior_ptid
;
1254 /* With non-stop mode on, threads are always handled
1256 resume_ptid
= inferior_ptid
;
1258 else if ((scheduler_mode
== schedlock_on
)
1259 || (scheduler_mode
== schedlock_step
1260 && (step
|| singlestep_breakpoints_inserted_p
)))
1262 /* User-settable 'scheduler' mode requires solo thread resume. */
1263 resume_ptid
= inferior_ptid
;
1266 if (gdbarch_cannot_step_breakpoint (gdbarch
))
1268 /* Most targets can step a breakpoint instruction, thus
1269 executing it normally. But if this one cannot, just
1270 continue and we will hit it anyway. */
1271 if (step
&& breakpoint_inserted_here_p (pc
))
1276 && use_displaced_stepping (gdbarch
)
1277 && tp
->trap_expected
)
1279 struct regcache
*resume_regcache
= get_thread_regcache (resume_ptid
);
1280 CORE_ADDR actual_pc
= regcache_read_pc (resume_regcache
);
1283 fprintf_unfiltered (gdb_stdlog
, "displaced: run 0x%s: ",
1284 paddr_nz (actual_pc
));
1285 read_memory (actual_pc
, buf
, sizeof (buf
));
1286 displaced_step_dump_bytes (gdb_stdlog
, buf
, sizeof (buf
));
1289 /* Install inferior's terminal modes. */
1290 target_terminal_inferior ();
1292 /* Avoid confusing the next resume, if the next stop/resume
1293 happens to apply to another thread. */
1294 tp
->stop_signal
= TARGET_SIGNAL_0
;
1296 target_resume (resume_ptid
, step
, sig
);
1299 discard_cleanups (old_cleanups
);
1304 /* Clear out all variables saying what to do when inferior is continued.
1305 First do this, then set the ones you want, then call `proceed'. */
1308 clear_proceed_status_thread (struct thread_info
*tp
)
1311 fprintf_unfiltered (gdb_stdlog
,
1312 "infrun: clear_proceed_status_thread (%s)\n",
1313 target_pid_to_str (tp
->ptid
));
1315 tp
->trap_expected
= 0;
1316 tp
->step_range_start
= 0;
1317 tp
->step_range_end
= 0;
1318 tp
->step_frame_id
= null_frame_id
;
1319 tp
->step_over_calls
= STEP_OVER_UNDEBUGGABLE
;
1320 tp
->stop_requested
= 0;
1324 tp
->proceed_to_finish
= 0;
1326 /* Discard any remaining commands or status from previous stop. */
1327 bpstat_clear (&tp
->stop_bpstat
);
1331 clear_proceed_status_callback (struct thread_info
*tp
, void *data
)
1333 if (is_exited (tp
->ptid
))
1336 clear_proceed_status_thread (tp
);
1341 clear_proceed_status (void)
1343 if (!ptid_equal (inferior_ptid
, null_ptid
))
1345 struct inferior
*inferior
;
1349 /* If in non-stop mode, only delete the per-thread status
1350 of the current thread. */
1351 clear_proceed_status_thread (inferior_thread ());
1355 /* In all-stop mode, delete the per-thread status of
1357 iterate_over_threads (clear_proceed_status_callback
, NULL
);
1360 inferior
= current_inferior ();
1361 inferior
->stop_soon
= NO_STOP_QUIETLY
;
1364 stop_after_trap
= 0;
1366 observer_notify_about_to_proceed ();
1370 regcache_xfree (stop_registers
);
1371 stop_registers
= NULL
;
1375 /* Check the current thread against the thread that reported the most recent
1376 event. If a step-over is required return TRUE and set the current thread
1377 to the old thread. Otherwise return FALSE.
1379 This should be suitable for any targets that support threads. */
1382 prepare_to_proceed (int step
)
1385 struct target_waitstatus wait_status
;
1386 int schedlock_enabled
;
1388 /* With non-stop mode on, threads are always handled individually. */
1389 gdb_assert (! non_stop
);
1391 /* Get the last target status returned by target_wait(). */
1392 get_last_target_status (&wait_ptid
, &wait_status
);
1394 /* Make sure we were stopped at a breakpoint. */
1395 if (wait_status
.kind
!= TARGET_WAITKIND_STOPPED
1396 || wait_status
.value
.sig
!= TARGET_SIGNAL_TRAP
)
1401 schedlock_enabled
= (scheduler_mode
== schedlock_on
1402 || (scheduler_mode
== schedlock_step
1405 /* Don't switch over to WAIT_PTID if scheduler locking is on. */
1406 if (schedlock_enabled
)
1409 /* Don't switch over if we're about to resume some other process
1410 other than WAIT_PTID's, and schedule-multiple is off. */
1412 && ptid_get_pid (wait_ptid
) != ptid_get_pid (inferior_ptid
))
1415 /* Switched over from WAIT_PID. */
1416 if (!ptid_equal (wait_ptid
, minus_one_ptid
)
1417 && !ptid_equal (inferior_ptid
, wait_ptid
))
1419 struct regcache
*regcache
= get_thread_regcache (wait_ptid
);
1421 if (breakpoint_here_p (regcache_read_pc (regcache
)))
1423 /* If stepping, remember current thread to switch back to. */
1425 deferred_step_ptid
= inferior_ptid
;
1427 /* Switch back to WAIT_PID thread. */
1428 switch_to_thread (wait_ptid
);
1430 /* We return 1 to indicate that there is a breakpoint here,
1431 so we need to step over it before continuing to avoid
1432 hitting it straight away. */
1440 /* Basic routine for continuing the program in various fashions.
1442 ADDR is the address to resume at, or -1 for resume where stopped.
1443 SIGGNAL is the signal to give it, or 0 for none,
1444 or -1 for act according to how it stopped.
1445 STEP is nonzero if should trap after one instruction.
1446 -1 means return after that and print nothing.
1447 You should probably set various step_... variables
1448 before calling here, if you are stepping.
1450 You should call clear_proceed_status before calling proceed. */
1453 proceed (CORE_ADDR addr
, enum target_signal siggnal
, int step
)
1455 struct regcache
*regcache
;
1456 struct gdbarch
*gdbarch
;
1457 struct thread_info
*tp
;
1461 /* If we're stopped at a fork/vfork, follow the branch set by the
1462 "set follow-fork-mode" command; otherwise, we'll just proceed
1463 resuming the current thread. */
1464 if (!follow_fork ())
1466 /* The target for some reason decided not to resume. */
1471 regcache
= get_current_regcache ();
1472 gdbarch
= get_regcache_arch (regcache
);
1473 pc
= regcache_read_pc (regcache
);
1476 step_start_function
= find_pc_function (pc
);
1478 stop_after_trap
= 1;
1480 if (addr
== (CORE_ADDR
) -1)
1482 if (pc
== stop_pc
&& breakpoint_here_p (pc
)
1483 && execution_direction
!= EXEC_REVERSE
)
1484 /* There is a breakpoint at the address we will resume at,
1485 step one instruction before inserting breakpoints so that
1486 we do not stop right away (and report a second hit at this
1489 Note, we don't do this in reverse, because we won't
1490 actually be executing the breakpoint insn anyway.
1491 We'll be (un-)executing the previous instruction. */
1494 else if (gdbarch_single_step_through_delay_p (gdbarch
)
1495 && gdbarch_single_step_through_delay (gdbarch
,
1496 get_current_frame ()))
1497 /* We stepped onto an instruction that needs to be stepped
1498 again before re-inserting the breakpoint, do so. */
1503 regcache_write_pc (regcache
, addr
);
1507 fprintf_unfiltered (gdb_stdlog
,
1508 "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n",
1509 paddr_nz (addr
), siggnal
, step
);
1512 /* In non-stop, each thread is handled individually. The context
1513 must already be set to the right thread here. */
1517 /* In a multi-threaded task we may select another thread and
1518 then continue or step.
1520 But if the old thread was stopped at a breakpoint, it will
1521 immediately cause another breakpoint stop without any
1522 execution (i.e. it will report a breakpoint hit incorrectly).
1523 So we must step over it first.
1525 prepare_to_proceed checks the current thread against the
1526 thread that reported the most recent event. If a step-over
1527 is required it returns TRUE and sets the current thread to
1529 if (prepare_to_proceed (step
))
1533 /* prepare_to_proceed may change the current thread. */
1534 tp
= inferior_thread ();
1538 tp
->trap_expected
= 1;
1539 /* If displaced stepping is enabled, we can step over the
1540 breakpoint without hitting it, so leave all breakpoints
1541 inserted. Otherwise we need to disable all breakpoints, step
1542 one instruction, and then re-add them when that step is
1544 if (!use_displaced_stepping (gdbarch
))
1545 remove_breakpoints ();
1548 /* We can insert breakpoints if we're not trying to step over one,
1549 or if we are stepping over one but we're using displaced stepping
1551 if (! tp
->trap_expected
|| use_displaced_stepping (gdbarch
))
1552 insert_breakpoints ();
1556 /* Pass the last stop signal to the thread we're resuming,
1557 irrespective of whether the current thread is the thread that
1558 got the last event or not. This was historically GDB's
1559 behaviour before keeping a stop_signal per thread. */
1561 struct thread_info
*last_thread
;
1563 struct target_waitstatus last_status
;
1565 get_last_target_status (&last_ptid
, &last_status
);
1566 if (!ptid_equal (inferior_ptid
, last_ptid
)
1567 && !ptid_equal (last_ptid
, null_ptid
)
1568 && !ptid_equal (last_ptid
, minus_one_ptid
))
1570 last_thread
= find_thread_ptid (last_ptid
);
1573 tp
->stop_signal
= last_thread
->stop_signal
;
1574 last_thread
->stop_signal
= TARGET_SIGNAL_0
;
1579 if (siggnal
!= TARGET_SIGNAL_DEFAULT
)
1580 tp
->stop_signal
= siggnal
;
1581 /* If this signal should not be seen by program,
1582 give it zero. Used for debugging signals. */
1583 else if (!signal_program
[tp
->stop_signal
])
1584 tp
->stop_signal
= TARGET_SIGNAL_0
;
1586 annotate_starting ();
1588 /* Make sure that output from GDB appears before output from the
1590 gdb_flush (gdb_stdout
);
1592 /* Refresh prev_pc value just prior to resuming. This used to be
1593 done in stop_stepping, however, setting prev_pc there did not handle
1594 scenarios such as inferior function calls or returning from
1595 a function via the return command. In those cases, the prev_pc
1596 value was not set properly for subsequent commands. The prev_pc value
1597 is used to initialize the starting line number in the ecs. With an
1598 invalid value, the gdb next command ends up stopping at the position
1599 represented by the next line table entry past our start position.
1600 On platforms that generate one line table entry per line, this
1601 is not a problem. However, on the ia64, the compiler generates
1602 extraneous line table entries that do not increase the line number.
1603 When we issue the gdb next command on the ia64 after an inferior call
1604 or a return command, we often end up a few instructions forward, still
1605 within the original line we started.
1607 An attempt was made to have init_execution_control_state () refresh
1608 the prev_pc value before calculating the line number. This approach
1609 did not work because on platforms that use ptrace, the pc register
1610 cannot be read unless the inferior is stopped. At that point, we
1611 are not guaranteed the inferior is stopped and so the regcache_read_pc ()
1612 call can fail. Setting the prev_pc value here ensures the value is
1613 updated correctly when the inferior is stopped. */
1614 tp
->prev_pc
= regcache_read_pc (get_current_regcache ());
1616 /* Fill in with reasonable starting values. */
1617 init_thread_stepping_state (tp
);
1619 /* Reset to normal state. */
1620 init_infwait_state ();
1622 /* Resume inferior. */
1623 resume (oneproc
|| step
|| bpstat_should_step (), tp
->stop_signal
);
1625 /* Wait for it to stop (if not standalone)
1626 and in any case decode why it stopped, and act accordingly. */
1627 /* Do this only if we are not using the event loop, or if the target
1628 does not support asynchronous execution. */
1629 if (!target_can_async_p ())
1631 wait_for_inferior (0);
1637 /* Start remote-debugging of a machine over a serial link. */
1640 start_remote (int from_tty
)
1642 struct inferior
*inferior
;
1643 init_wait_for_inferior ();
1645 inferior
= current_inferior ();
1646 inferior
->stop_soon
= STOP_QUIETLY_REMOTE
;
1648 /* Always go on waiting for the target, regardless of the mode. */
1649 /* FIXME: cagney/1999-09-23: At present it isn't possible to
1650 indicate to wait_for_inferior that a target should timeout if
1651 nothing is returned (instead of just blocking). Because of this,
1652 targets expecting an immediate response need to, internally, set
1653 things up so that the target_wait() is forced to eventually
1655 /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
1656 differentiate to its caller what the state of the target is after
1657 the initial open has been performed. Here we're assuming that
1658 the target has stopped. It should be possible to eventually have
1659 target_open() return to the caller an indication that the target
1660 is currently running and GDB state should be set to the same as
1661 for an async run. */
1662 wait_for_inferior (0);
1664 /* Now that the inferior has stopped, do any bookkeeping like
1665 loading shared libraries. We want to do this before normal_stop,
1666 so that the displayed frame is up to date. */
1667 post_create_inferior (¤t_target
, from_tty
);
1672 /* Initialize static vars when a new inferior begins. */
1675 init_wait_for_inferior (void)
1677 /* These are meaningless until the first time through wait_for_inferior. */
1679 breakpoint_init_inferior (inf_starting
);
1681 clear_proceed_status ();
1683 stepping_past_singlestep_breakpoint
= 0;
1684 deferred_step_ptid
= null_ptid
;
1686 target_last_wait_ptid
= minus_one_ptid
;
1688 previous_inferior_ptid
= null_ptid
;
1689 init_infwait_state ();
1691 displaced_step_clear ();
1695 /* This enum encodes possible reasons for doing a target_wait, so that
1696 wfi can call target_wait in one place. (Ultimately the call will be
1697 moved out of the infinite loop entirely.) */
1701 infwait_normal_state
,
1702 infwait_thread_hop_state
,
1703 infwait_step_watch_state
,
1704 infwait_nonstep_watch_state
1707 /* Why did the inferior stop? Used to print the appropriate messages
1708 to the interface from within handle_inferior_event(). */
1709 enum inferior_stop_reason
1711 /* Step, next, nexti, stepi finished. */
1713 /* Inferior terminated by signal. */
1715 /* Inferior exited. */
1717 /* Inferior received signal, and user asked to be notified. */
1719 /* Reverse execution -- target ran out of history info. */
1723 /* The PTID we'll do a target_wait on.*/
1726 /* Current inferior wait state. */
1727 enum infwait_states infwait_state
;
1729 /* Data to be passed around while handling an event. This data is
1730 discarded between events. */
1731 struct execution_control_state
1734 /* The thread that got the event, if this was a thread event; NULL
1736 struct thread_info
*event_thread
;
1738 struct target_waitstatus ws
;
1740 CORE_ADDR stop_func_start
;
1741 CORE_ADDR stop_func_end
;
1742 char *stop_func_name
;
1743 int new_thread_event
;
1747 void init_execution_control_state (struct execution_control_state
*ecs
);
1749 void handle_inferior_event (struct execution_control_state
*ecs
);
1751 static void handle_step_into_function (struct gdbarch
*gdbarch
,
1752 struct execution_control_state
*ecs
);
1753 static void handle_step_into_function_backward (struct gdbarch
*gdbarch
,
1754 struct execution_control_state
*ecs
);
1755 static void insert_step_resume_breakpoint_at_frame (struct frame_info
*step_frame
);
1756 static void insert_step_resume_breakpoint_at_caller (struct frame_info
*);
1757 static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
1758 struct frame_id sr_id
);
1759 static void insert_longjmp_resume_breakpoint (CORE_ADDR
);
1761 static void stop_stepping (struct execution_control_state
*ecs
);
1762 static void prepare_to_wait (struct execution_control_state
*ecs
);
1763 static void keep_going (struct execution_control_state
*ecs
);
1764 static void print_stop_reason (enum inferior_stop_reason stop_reason
,
1767 /* Callback for iterate over threads. If the thread is stopped, but
1768 the user/frontend doesn't know about that yet, go through
1769 normal_stop, as if the thread had just stopped now. ARG points at
1770 a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If
1771 ptid_is_pid(PTID) is true, applies to all threads of the process
1772 pointed at by PTID. Otherwise, apply only to the thread pointed by
1776 infrun_thread_stop_requested_callback (struct thread_info
*info
, void *arg
)
1778 ptid_t ptid
= * (ptid_t
*) arg
;
1780 if ((ptid_equal (info
->ptid
, ptid
)
1781 || ptid_equal (minus_one_ptid
, ptid
)
1782 || (ptid_is_pid (ptid
)
1783 && ptid_get_pid (ptid
) == ptid_get_pid (info
->ptid
)))
1784 && is_running (info
->ptid
)
1785 && !is_executing (info
->ptid
))
1787 struct cleanup
*old_chain
;
1788 struct execution_control_state ecss
;
1789 struct execution_control_state
*ecs
= &ecss
;
1791 memset (ecs
, 0, sizeof (*ecs
));
1793 old_chain
= make_cleanup_restore_current_thread ();
1795 switch_to_thread (info
->ptid
);
1797 /* Go through handle_inferior_event/normal_stop, so we always
1798 have consistent output as if the stop event had been
1800 ecs
->ptid
= info
->ptid
;
1801 ecs
->event_thread
= find_thread_ptid (info
->ptid
);
1802 ecs
->ws
.kind
= TARGET_WAITKIND_STOPPED
;
1803 ecs
->ws
.value
.sig
= TARGET_SIGNAL_0
;
1805 handle_inferior_event (ecs
);
1807 if (!ecs
->wait_some_more
)
1809 struct thread_info
*tp
;
1813 /* Finish off the continuations. The continations
1814 themselves are responsible for realising the thread
1815 didn't finish what it was supposed to do. */
1816 tp
= inferior_thread ();
1817 do_all_intermediate_continuations_thread (tp
);
1818 do_all_continuations_thread (tp
);
1821 do_cleanups (old_chain
);
1827 /* This function is attached as a "thread_stop_requested" observer.
1828 Cleanup local state that assumed the PTID was to be resumed, and
1829 report the stop to the frontend. */
1832 infrun_thread_stop_requested (ptid_t ptid
)
1834 struct displaced_step_request
*it
, *next
, *prev
= NULL
;
1836 /* PTID was requested to stop. Remove it from the displaced
1837 stepping queue, so we don't try to resume it automatically. */
1838 for (it
= displaced_step_request_queue
; it
; it
= next
)
1842 if (ptid_equal (it
->ptid
, ptid
)
1843 || ptid_equal (minus_one_ptid
, ptid
)
1844 || (ptid_is_pid (ptid
)
1845 && ptid_get_pid (ptid
) == ptid_get_pid (it
->ptid
)))
1847 if (displaced_step_request_queue
== it
)
1848 displaced_step_request_queue
= it
->next
;
1850 prev
->next
= it
->next
;
1858 iterate_over_threads (infrun_thread_stop_requested_callback
, &ptid
);
1862 infrun_thread_thread_exit (struct thread_info
*tp
, int silent
)
1864 if (ptid_equal (target_last_wait_ptid
, tp
->ptid
))
1865 nullify_last_target_wait_ptid ();
1868 /* Callback for iterate_over_threads. */
1871 delete_step_resume_breakpoint_callback (struct thread_info
*info
, void *data
)
1873 if (is_exited (info
->ptid
))
1876 delete_step_resume_breakpoint (info
);
1880 /* In all-stop, delete the step resume breakpoint of any thread that
1881 had one. In non-stop, delete the step resume breakpoint of the
1882 thread that just stopped. */
1885 delete_step_thread_step_resume_breakpoint (void)
1887 if (!target_has_execution
1888 || ptid_equal (inferior_ptid
, null_ptid
))
1889 /* If the inferior has exited, we have already deleted the step
1890 resume breakpoints out of GDB's lists. */
1895 /* If in non-stop mode, only delete the step-resume or
1896 longjmp-resume breakpoint of the thread that just stopped
1898 struct thread_info
*tp
= inferior_thread ();
1899 delete_step_resume_breakpoint (tp
);
1902 /* In all-stop mode, delete all step-resume and longjmp-resume
1903 breakpoints of any thread that had them. */
1904 iterate_over_threads (delete_step_resume_breakpoint_callback
, NULL
);
1907 /* A cleanup wrapper. */
1910 delete_step_thread_step_resume_breakpoint_cleanup (void *arg
)
1912 delete_step_thread_step_resume_breakpoint ();
1915 /* Pretty print the results of target_wait, for debugging purposes. */
1918 print_target_wait_results (ptid_t waiton_ptid
, ptid_t result_ptid
,
1919 const struct target_waitstatus
*ws
)
1921 char *status_string
= target_waitstatus_to_string (ws
);
1922 struct ui_file
*tmp_stream
= mem_fileopen ();
1926 /* The text is split over several lines because it was getting too long.
1927 Call fprintf_unfiltered (gdb_stdlog) once so that the text is still
1928 output as a unit; we want only one timestamp printed if debug_timestamp
1931 fprintf_unfiltered (tmp_stream
,
1932 "infrun: target_wait (%d", PIDGET (waiton_ptid
));
1933 if (PIDGET (waiton_ptid
) != -1)
1934 fprintf_unfiltered (tmp_stream
,
1935 " [%s]", target_pid_to_str (waiton_ptid
));
1936 fprintf_unfiltered (tmp_stream
, ", status) =\n");
1937 fprintf_unfiltered (tmp_stream
,
1938 "infrun: %d [%s],\n",
1939 PIDGET (result_ptid
), target_pid_to_str (result_ptid
));
1940 fprintf_unfiltered (tmp_stream
,
1944 text
= ui_file_xstrdup (tmp_stream
, &len
);
1946 /* This uses %s in part to handle %'s in the text, but also to avoid
1947 a gcc error: the format attribute requires a string literal. */
1948 fprintf_unfiltered (gdb_stdlog
, "%s", text
);
1950 xfree (status_string
);
1952 ui_file_delete (tmp_stream
);
1955 /* Wait for control to return from inferior to debugger.
1957 If TREAT_EXEC_AS_SIGTRAP is non-zero, then handle EXEC signals
1958 as if they were SIGTRAP signals. This can be useful during
1959 the startup sequence on some targets such as HP/UX, where
1960 we receive an EXEC event instead of the expected SIGTRAP.
1962 If inferior gets a signal, we may decide to start it up again
1963 instead of returning. That is why there is a loop in this function.
1964 When this function actually returns it means the inferior
1965 should be left stopped and GDB should read more commands. */
1968 wait_for_inferior (int treat_exec_as_sigtrap
)
1970 struct cleanup
*old_cleanups
;
1971 struct execution_control_state ecss
;
1972 struct execution_control_state
*ecs
;
1976 (gdb_stdlog
, "infrun: wait_for_inferior (treat_exec_as_sigtrap=%d)\n",
1977 treat_exec_as_sigtrap
);
1980 make_cleanup (delete_step_thread_step_resume_breakpoint_cleanup
, NULL
);
1983 memset (ecs
, 0, sizeof (*ecs
));
1985 overlay_cache_invalid
= 1;
1987 /* We'll update this if & when we switch to a new thread. */
1988 previous_inferior_ptid
= inferior_ptid
;
1990 /* We have to invalidate the registers BEFORE calling target_wait
1991 because they can be loaded from the target while in target_wait.
1992 This makes remote debugging a bit more efficient for those
1993 targets that provide critical registers as part of their normal
1994 status mechanism. */
1996 registers_changed ();
2000 struct cleanup
*old_chain
;
2002 if (deprecated_target_wait_hook
)
2003 ecs
->ptid
= deprecated_target_wait_hook (waiton_ptid
, &ecs
->ws
, 0);
2005 ecs
->ptid
= target_wait (waiton_ptid
, &ecs
->ws
, 0);
2008 print_target_wait_results (waiton_ptid
, ecs
->ptid
, &ecs
->ws
);
2010 if (treat_exec_as_sigtrap
&& ecs
->ws
.kind
== TARGET_WAITKIND_EXECD
)
2012 xfree (ecs
->ws
.value
.execd_pathname
);
2013 ecs
->ws
.kind
= TARGET_WAITKIND_STOPPED
;
2014 ecs
->ws
.value
.sig
= TARGET_SIGNAL_TRAP
;
2017 /* If an error happens while handling the event, propagate GDB's
2018 knowledge of the executing state to the frontend/user running
2020 old_chain
= make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
2022 /* Now figure out what to do with the result of the result. */
2023 handle_inferior_event (ecs
);
2025 /* No error, don't finish the state yet. */
2026 discard_cleanups (old_chain
);
2028 if (!ecs
->wait_some_more
)
2032 do_cleanups (old_cleanups
);
2035 /* Asynchronous version of wait_for_inferior. It is called by the
2036 event loop whenever a change of state is detected on the file
2037 descriptor corresponding to the target. It can be called more than
2038 once to complete a single execution command. In such cases we need
2039 to keep the state in a global variable ECSS. If it is the last time
2040 that this function is called for a single execution command, then
2041 report to the user that the inferior has stopped, and do the
2042 necessary cleanups. */
2045 fetch_inferior_event (void *client_data
)
2047 struct execution_control_state ecss
;
2048 struct execution_control_state
*ecs
= &ecss
;
2049 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
2050 struct cleanup
*ts_old_chain
;
2051 int was_sync
= sync_execution
;
2053 memset (ecs
, 0, sizeof (*ecs
));
2055 overlay_cache_invalid
= 1;
2057 /* We can only rely on wait_for_more being correct before handling
2058 the event in all-stop, but previous_inferior_ptid isn't used in
2060 if (!ecs
->wait_some_more
)
2061 /* We'll update this if & when we switch to a new thread. */
2062 previous_inferior_ptid
= inferior_ptid
;
2065 /* In non-stop mode, the user/frontend should not notice a thread
2066 switch due to internal events. Make sure we reverse to the
2067 user selected thread and frame after handling the event and
2068 running any breakpoint commands. */
2069 make_cleanup_restore_current_thread ();
2071 /* We have to invalidate the registers BEFORE calling target_wait
2072 because they can be loaded from the target while in target_wait.
2073 This makes remote debugging a bit more efficient for those
2074 targets that provide critical registers as part of their normal
2075 status mechanism. */
2077 registers_changed ();
2079 if (deprecated_target_wait_hook
)
2081 deprecated_target_wait_hook (waiton_ptid
, &ecs
->ws
, TARGET_WNOHANG
);
2083 ecs
->ptid
= target_wait (waiton_ptid
, &ecs
->ws
, TARGET_WNOHANG
);
2086 print_target_wait_results (waiton_ptid
, ecs
->ptid
, &ecs
->ws
);
2089 && ecs
->ws
.kind
!= TARGET_WAITKIND_IGNORE
2090 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
2091 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
)
2092 /* In non-stop mode, each thread is handled individually. Switch
2093 early, so the global state is set correctly for this
2095 context_switch (ecs
->ptid
);
2097 /* If an error happens while handling the event, propagate GDB's
2098 knowledge of the executing state to the frontend/user running
2101 ts_old_chain
= make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
2103 ts_old_chain
= make_cleanup (finish_thread_state_cleanup
, &ecs
->ptid
);
2105 /* Now figure out what to do with the result of the result. */
2106 handle_inferior_event (ecs
);
2108 if (!ecs
->wait_some_more
)
2110 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
2112 delete_step_thread_step_resume_breakpoint ();
2114 /* We may not find an inferior if this was a process exit. */
2115 if (inf
== NULL
|| inf
->stop_soon
== NO_STOP_QUIETLY
)
2118 if (target_has_execution
2119 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
2120 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
2121 && ecs
->event_thread
->step_multi
2122 && ecs
->event_thread
->stop_step
)
2123 inferior_event_handler (INF_EXEC_CONTINUE
, NULL
);
2125 inferior_event_handler (INF_EXEC_COMPLETE
, NULL
);
2128 /* No error, don't finish the thread states yet. */
2129 discard_cleanups (ts_old_chain
);
2131 /* Revert thread and frame. */
2132 do_cleanups (old_chain
);
2134 /* If the inferior was in sync execution mode, and now isn't,
2135 restore the prompt. */
2136 if (was_sync
&& !sync_execution
)
2137 display_gdb_prompt (0);
2140 /* Prepare an execution control state for looping through a
2141 wait_for_inferior-type loop. */
2144 init_execution_control_state (struct execution_control_state
*ecs
)
2146 ecs
->random_signal
= 0;
2149 /* Clear context switchable stepping state. */
2152 init_thread_stepping_state (struct thread_info
*tss
)
2154 struct symtab_and_line sal
;
2156 tss
->stepping_over_breakpoint
= 0;
2157 tss
->step_after_step_resume_breakpoint
= 0;
2158 tss
->stepping_through_solib_after_catch
= 0;
2159 tss
->stepping_through_solib_catchpoints
= NULL
;
2161 sal
= find_pc_line (tss
->prev_pc
, 0);
2162 tss
->current_line
= sal
.line
;
2163 tss
->current_symtab
= sal
.symtab
;
2166 /* Return the cached copy of the last pid/waitstatus returned by
2167 target_wait()/deprecated_target_wait_hook(). The data is actually
2168 cached by handle_inferior_event(), which gets called immediately
2169 after target_wait()/deprecated_target_wait_hook(). */
2172 get_last_target_status (ptid_t
*ptidp
, struct target_waitstatus
*status
)
2174 *ptidp
= target_last_wait_ptid
;
2175 *status
= target_last_waitstatus
;
2179 nullify_last_target_wait_ptid (void)
2181 target_last_wait_ptid
= minus_one_ptid
;
2184 /* Switch thread contexts. */
2187 context_switch (ptid_t ptid
)
2191 fprintf_unfiltered (gdb_stdlog
, "infrun: Switching context from %s ",
2192 target_pid_to_str (inferior_ptid
));
2193 fprintf_unfiltered (gdb_stdlog
, "to %s\n",
2194 target_pid_to_str (ptid
));
2197 switch_to_thread (ptid
);
2201 adjust_pc_after_break (struct execution_control_state
*ecs
)
2203 struct regcache
*regcache
;
2204 struct gdbarch
*gdbarch
;
2205 CORE_ADDR breakpoint_pc
;
2207 /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
2208 we aren't, just return.
2210 We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
2211 affected by gdbarch_decr_pc_after_break. Other waitkinds which are
2212 implemented by software breakpoints should be handled through the normal
2215 NOTE drow/2004-01-31: On some targets, breakpoints may generate
2216 different signals (SIGILL or SIGEMT for instance), but it is less
2217 clear where the PC is pointing afterwards. It may not match
2218 gdbarch_decr_pc_after_break. I don't know any specific target that
2219 generates these signals at breakpoints (the code has been in GDB since at
2220 least 1992) so I can not guess how to handle them here.
2222 In earlier versions of GDB, a target with
2223 gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a
2224 watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any
2225 target with both of these set in GDB history, and it seems unlikely to be
2226 correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */
2228 if (ecs
->ws
.kind
!= TARGET_WAITKIND_STOPPED
)
2231 if (ecs
->ws
.value
.sig
!= TARGET_SIGNAL_TRAP
)
2234 /* In reverse execution, when a breakpoint is hit, the instruction
2235 under it has already been de-executed. The reported PC always
2236 points at the breakpoint address, so adjusting it further would
2237 be wrong. E.g., consider this case on a decr_pc_after_break == 1
2240 B1 0x08000000 : INSN1
2241 B2 0x08000001 : INSN2
2243 PC -> 0x08000003 : INSN4
2245 Say you're stopped at 0x08000003 as above. Reverse continuing
2246 from that point should hit B2 as below. Reading the PC when the
2247 SIGTRAP is reported should read 0x08000001 and INSN2 should have
2248 been de-executed already.
2250 B1 0x08000000 : INSN1
2251 B2 PC -> 0x08000001 : INSN2
2255 We can't apply the same logic as for forward execution, because
2256 we would wrongly adjust the PC to 0x08000000, since there's a
2257 breakpoint at PC - 1. We'd then report a hit on B1, although
2258 INSN1 hadn't been de-executed yet. Doing nothing is the correct
2260 if (execution_direction
== EXEC_REVERSE
)
2263 /* If this target does not decrement the PC after breakpoints, then
2264 we have nothing to do. */
2265 regcache
= get_thread_regcache (ecs
->ptid
);
2266 gdbarch
= get_regcache_arch (regcache
);
2267 if (gdbarch_decr_pc_after_break (gdbarch
) == 0)
2270 /* Find the location where (if we've hit a breakpoint) the
2271 breakpoint would be. */
2272 breakpoint_pc
= regcache_read_pc (regcache
)
2273 - gdbarch_decr_pc_after_break (gdbarch
);
2275 /* Check whether there actually is a software breakpoint inserted at
2278 If in non-stop mode, a race condition is possible where we've
2279 removed a breakpoint, but stop events for that breakpoint were
2280 already queued and arrive later. To suppress those spurious
2281 SIGTRAPs, we keep a list of such breakpoint locations for a bit,
2282 and retire them after a number of stop events are reported. */
2283 if (software_breakpoint_inserted_here_p (breakpoint_pc
)
2284 || (non_stop
&& moribund_breakpoint_here_p (breakpoint_pc
)))
2286 struct cleanup
*old_cleanups
= NULL
;
2288 old_cleanups
= record_gdb_operation_disable_set ();
2290 /* When using hardware single-step, a SIGTRAP is reported for both
2291 a completed single-step and a software breakpoint. Need to
2292 differentiate between the two, as the latter needs adjusting
2293 but the former does not.
2295 The SIGTRAP can be due to a completed hardware single-step only if
2296 - we didn't insert software single-step breakpoints
2297 - the thread to be examined is still the current thread
2298 - this thread is currently being stepped
2300 If any of these events did not occur, we must have stopped due
2301 to hitting a software breakpoint, and have to back up to the
2304 As a special case, we could have hardware single-stepped a
2305 software breakpoint. In this case (prev_pc == breakpoint_pc),
2306 we also need to back up to the breakpoint address. */
2308 if (singlestep_breakpoints_inserted_p
2309 || !ptid_equal (ecs
->ptid
, inferior_ptid
)
2310 || !currently_stepping (ecs
->event_thread
)
2311 || ecs
->event_thread
->prev_pc
== breakpoint_pc
)
2312 regcache_write_pc (regcache
, breakpoint_pc
);
2315 do_cleanups (old_cleanups
);
2320 init_infwait_state (void)
2322 waiton_ptid
= pid_to_ptid (-1);
2323 infwait_state
= infwait_normal_state
;
2327 error_is_running (void)
2330 Cannot execute this command while the selected thread is running."));
2334 ensure_not_running (void)
2336 if (is_running (inferior_ptid
))
2337 error_is_running ();
2340 /* Given an execution control state that has been freshly filled in
2341 by an event from the inferior, figure out what it means and take
2342 appropriate action. */
2345 handle_inferior_event (struct execution_control_state
*ecs
)
2347 struct frame_info
*frame
;
2348 struct gdbarch
*gdbarch
;
2349 int sw_single_step_trap_p
= 0;
2350 int stopped_by_watchpoint
;
2351 int stepped_after_stopped_by_watchpoint
= 0;
2352 struct symtab_and_line stop_pc_sal
;
2353 enum stop_kind stop_soon
;
2355 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
2356 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
2357 && ecs
->ws
.kind
!= TARGET_WAITKIND_IGNORE
)
2359 struct inferior
*inf
= find_inferior_pid (ptid_get_pid (ecs
->ptid
));
2361 stop_soon
= inf
->stop_soon
;
2364 stop_soon
= NO_STOP_QUIETLY
;
2366 /* Cache the last pid/waitstatus. */
2367 target_last_wait_ptid
= ecs
->ptid
;
2368 target_last_waitstatus
= ecs
->ws
;
2370 /* Always clear state belonging to the previous time we stopped. */
2371 stop_stack_dummy
= 0;
2373 /* If it's a new process, add it to the thread database */
2375 ecs
->new_thread_event
= (!ptid_equal (ecs
->ptid
, inferior_ptid
)
2376 && !ptid_equal (ecs
->ptid
, minus_one_ptid
)
2377 && !in_thread_list (ecs
->ptid
));
2379 if (ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
2380 && ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
&& ecs
->new_thread_event
)
2381 add_thread (ecs
->ptid
);
2383 ecs
->event_thread
= find_thread_ptid (ecs
->ptid
);
2385 /* Dependent on valid ECS->EVENT_THREAD. */
2386 adjust_pc_after_break (ecs
);
2388 /* Dependent on the current PC value modified by adjust_pc_after_break. */
2389 reinit_frame_cache ();
2391 if (ecs
->ws
.kind
!= TARGET_WAITKIND_IGNORE
)
2393 breakpoint_retire_moribund ();
2395 /* Mark the non-executing threads accordingly. In all-stop, all
2396 threads of all processes are stopped when we get any event
2397 reported. In non-stop mode, only the event thread stops. If
2398 we're handling a process exit in non-stop mode, there's
2399 nothing to do, as threads of the dead process are gone, and
2400 threads of any other process were left running. */
2402 set_executing (minus_one_ptid
, 0);
2403 else if (ecs
->ws
.kind
!= TARGET_WAITKIND_SIGNALLED
2404 && ecs
->ws
.kind
!= TARGET_WAITKIND_EXITED
)
2405 set_executing (inferior_ptid
, 0);
2408 switch (infwait_state
)
2410 case infwait_thread_hop_state
:
2412 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_thread_hop_state\n");
2413 /* Cancel the waiton_ptid. */
2414 waiton_ptid
= pid_to_ptid (-1);
2417 case infwait_normal_state
:
2419 fprintf_unfiltered (gdb_stdlog
, "infrun: infwait_normal_state\n");
2422 case infwait_step_watch_state
:
2424 fprintf_unfiltered (gdb_stdlog
,
2425 "infrun: infwait_step_watch_state\n");
2427 stepped_after_stopped_by_watchpoint
= 1;
2430 case infwait_nonstep_watch_state
:
2432 fprintf_unfiltered (gdb_stdlog
,
2433 "infrun: infwait_nonstep_watch_state\n");
2434 insert_breakpoints ();
2436 /* FIXME-maybe: is this cleaner than setting a flag? Does it
2437 handle things like signals arriving and other things happening
2438 in combination correctly? */
2439 stepped_after_stopped_by_watchpoint
= 1;
2443 internal_error (__FILE__
, __LINE__
, _("bad switch"));
2445 infwait_state
= infwait_normal_state
;
2447 switch (ecs
->ws
.kind
)
2449 case TARGET_WAITKIND_LOADED
:
2451 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_LOADED\n");
2452 /* Ignore gracefully during startup of the inferior, as it might
2453 be the shell which has just loaded some objects, otherwise
2454 add the symbols for the newly loaded objects. Also ignore at
2455 the beginning of an attach or remote session; we will query
2456 the full list of libraries once the connection is
2458 if (stop_soon
== NO_STOP_QUIETLY
)
2460 /* Check for any newly added shared libraries if we're
2461 supposed to be adding them automatically. Switch
2462 terminal for any messages produced by
2463 breakpoint_re_set. */
2464 target_terminal_ours_for_output ();
2465 /* NOTE: cagney/2003-11-25: Make certain that the target
2466 stack's section table is kept up-to-date. Architectures,
2467 (e.g., PPC64), use the section table to perform
2468 operations such as address => section name and hence
2469 require the table to contain all sections (including
2470 those found in shared libraries). */
2472 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
2474 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
2476 target_terminal_inferior ();
2478 /* If requested, stop when the dynamic linker notifies
2479 gdb of events. This allows the user to get control
2480 and place breakpoints in initializer routines for
2481 dynamically loaded objects (among other things). */
2482 if (stop_on_solib_events
)
2484 stop_stepping (ecs
);
2488 /* NOTE drow/2007-05-11: This might be a good place to check
2489 for "catch load". */
2492 /* If we are skipping through a shell, or through shared library
2493 loading that we aren't interested in, resume the program. If
2494 we're running the program normally, also resume. But stop if
2495 we're attaching or setting up a remote connection. */
2496 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== NO_STOP_QUIETLY
)
2498 /* Loading of shared libraries might have changed breakpoint
2499 addresses. Make sure new breakpoints are inserted. */
2500 if (stop_soon
== NO_STOP_QUIETLY
2501 && !breakpoints_always_inserted_mode ())
2502 insert_breakpoints ();
2503 resume (0, TARGET_SIGNAL_0
);
2504 prepare_to_wait (ecs
);
2510 case TARGET_WAITKIND_SPURIOUS
:
2512 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SPURIOUS\n");
2513 resume (0, TARGET_SIGNAL_0
);
2514 prepare_to_wait (ecs
);
2517 case TARGET_WAITKIND_EXITED
:
2519 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXITED\n");
2520 inferior_ptid
= ecs
->ptid
;
2521 target_terminal_ours (); /* Must do this before mourn anyway */
2522 print_stop_reason (EXITED
, ecs
->ws
.value
.integer
);
2524 /* Record the exit code in the convenience variable $_exitcode, so
2525 that the user can inspect this again later. */
2526 set_internalvar_integer (lookup_internalvar ("_exitcode"),
2527 (LONGEST
) ecs
->ws
.value
.integer
);
2528 gdb_flush (gdb_stdout
);
2529 target_mourn_inferior ();
2530 singlestep_breakpoints_inserted_p
= 0;
2531 stop_print_frame
= 0;
2532 stop_stepping (ecs
);
2535 case TARGET_WAITKIND_SIGNALLED
:
2537 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SIGNALLED\n");
2538 inferior_ptid
= ecs
->ptid
;
2539 stop_print_frame
= 0;
2540 target_terminal_ours (); /* Must do this before mourn anyway */
2542 /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't
2543 reach here unless the inferior is dead. However, for years
2544 target_kill() was called here, which hints that fatal signals aren't
2545 really fatal on some systems. If that's true, then some changes
2547 target_mourn_inferior ();
2549 print_stop_reason (SIGNAL_EXITED
, ecs
->ws
.value
.sig
);
2550 singlestep_breakpoints_inserted_p
= 0;
2551 stop_stepping (ecs
);
2554 /* The following are the only cases in which we keep going;
2555 the above cases end in a continue or goto. */
2556 case TARGET_WAITKIND_FORKED
:
2557 case TARGET_WAITKIND_VFORKED
:
2559 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_FORKED\n");
2561 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2563 context_switch (ecs
->ptid
);
2564 reinit_frame_cache ();
2567 /* Immediately detach breakpoints from the child before there's
2568 any chance of letting the user delete breakpoints from the
2569 breakpoint lists. If we don't do this early, it's easy to
2570 leave left over traps in the child, vis: "break foo; catch
2571 fork; c; <fork>; del; c; <child calls foo>". We only follow
2572 the fork on the last `continue', and by that time the
2573 breakpoint at "foo" is long gone from the breakpoint table.
2574 If we vforked, then we don't need to unpatch here, since both
2575 parent and child are sharing the same memory pages; we'll
2576 need to unpatch at follow/detach time instead to be certain
2577 that new breakpoints added between catchpoint hit time and
2578 vfork follow are detached. */
2579 if (ecs
->ws
.kind
!= TARGET_WAITKIND_VFORKED
)
2581 int child_pid
= ptid_get_pid (ecs
->ws
.value
.related_pid
);
2583 /* This won't actually modify the breakpoint list, but will
2584 physically remove the breakpoints from the child. */
2585 detach_breakpoints (child_pid
);
2588 /* In case the event is caught by a catchpoint, remember that
2589 the event is to be followed at the next resume of the thread,
2590 and not immediately. */
2591 ecs
->event_thread
->pending_follow
= ecs
->ws
;
2593 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
2595 ecs
->event_thread
->stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2597 ecs
->random_signal
= !bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
);
2599 /* If no catchpoint triggered for this, then keep going. */
2600 if (ecs
->random_signal
)
2604 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2606 should_resume
= follow_fork ();
2608 ecs
->event_thread
= inferior_thread ();
2609 ecs
->ptid
= inferior_ptid
;
2614 stop_stepping (ecs
);
2617 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_TRAP
;
2618 goto process_event_stop_test
;
2620 case TARGET_WAITKIND_EXECD
:
2622 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_EXECD\n");
2624 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2626 context_switch (ecs
->ptid
);
2627 reinit_frame_cache ();
2630 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
2632 /* This causes the eventpoints and symbol table to be reset.
2633 Must do this now, before trying to determine whether to
2635 follow_exec (inferior_ptid
, ecs
->ws
.value
.execd_pathname
);
2637 ecs
->event_thread
->stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
2638 ecs
->random_signal
= !bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
);
2640 /* Note that this may be referenced from inside
2641 bpstat_stop_status above, through inferior_has_execd. */
2642 xfree (ecs
->ws
.value
.execd_pathname
);
2643 ecs
->ws
.value
.execd_pathname
= NULL
;
2645 /* If no catchpoint triggered for this, then keep going. */
2646 if (ecs
->random_signal
)
2648 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2652 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_TRAP
;
2653 goto process_event_stop_test
;
2655 /* Be careful not to try to gather much state about a thread
2656 that's in a syscall. It's frequently a losing proposition. */
2657 case TARGET_WAITKIND_SYSCALL_ENTRY
:
2659 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n");
2660 resume (0, TARGET_SIGNAL_0
);
2661 prepare_to_wait (ecs
);
2664 /* Before examining the threads further, step this thread to
2665 get it entirely out of the syscall. (We get notice of the
2666 event when the thread is just on the verge of exiting a
2667 syscall. Stepping one instruction seems to get it back
2669 case TARGET_WAITKIND_SYSCALL_RETURN
:
2671 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n");
2672 target_resume (ecs
->ptid
, 1, TARGET_SIGNAL_0
);
2673 prepare_to_wait (ecs
);
2676 case TARGET_WAITKIND_STOPPED
:
2678 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_STOPPED\n");
2679 ecs
->event_thread
->stop_signal
= ecs
->ws
.value
.sig
;
2682 case TARGET_WAITKIND_NO_HISTORY
:
2683 /* Reverse execution: target ran out of history info. */
2684 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
2685 print_stop_reason (NO_HISTORY
, 0);
2686 stop_stepping (ecs
);
2689 /* We had an event in the inferior, but we are not interested
2690 in handling it at this level. The lower layers have already
2691 done what needs to be done, if anything.
2693 One of the possible circumstances for this is when the
2694 inferior produces output for the console. The inferior has
2695 not stopped, and we are ignoring the event. Another possible
2696 circumstance is any event which the lower level knows will be
2697 reported multiple times without an intervening resume. */
2698 case TARGET_WAITKIND_IGNORE
:
2700 fprintf_unfiltered (gdb_stdlog
, "infrun: TARGET_WAITKIND_IGNORE\n");
2701 prepare_to_wait (ecs
);
2705 if (ecs
->new_thread_event
)
2708 /* Non-stop assumes that the target handles adding new threads
2709 to the thread list. */
2710 internal_error (__FILE__
, __LINE__
, "\
2711 targets should add new threads to the thread list themselves in non-stop mode.");
2713 /* We may want to consider not doing a resume here in order to
2714 give the user a chance to play with the new thread. It might
2715 be good to make that a user-settable option. */
2717 /* At this point, all threads are stopped (happens automatically
2718 in either the OS or the native code). Therefore we need to
2719 continue all threads in order to make progress. */
2721 target_resume (RESUME_ALL
, 0, TARGET_SIGNAL_0
);
2722 prepare_to_wait (ecs
);
2726 if (ecs
->ws
.kind
== TARGET_WAITKIND_STOPPED
)
2728 /* Do we need to clean up the state of a thread that has
2729 completed a displaced single-step? (Doing so usually affects
2730 the PC, so do it here, before we set stop_pc.) */
2731 displaced_step_fixup (ecs
->ptid
, ecs
->event_thread
->stop_signal
);
2733 /* If we either finished a single-step or hit a breakpoint, but
2734 the user wanted this thread to be stopped, pretend we got a
2735 SIG0 (generic unsignaled stop). */
2737 if (ecs
->event_thread
->stop_requested
2738 && ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2739 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2742 stop_pc
= regcache_read_pc (get_thread_regcache (ecs
->ptid
));
2746 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_pc = 0x%s\n",
2747 paddr_nz (stop_pc
));
2748 if (target_stopped_by_watchpoint ())
2751 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped by watchpoint\n");
2753 if (target_stopped_data_address (¤t_target
, &addr
))
2754 fprintf_unfiltered (gdb_stdlog
,
2755 "infrun: stopped data address = 0x%s\n",
2758 fprintf_unfiltered (gdb_stdlog
,
2759 "infrun: (no data address available)\n");
2763 if (stepping_past_singlestep_breakpoint
)
2765 gdb_assert (singlestep_breakpoints_inserted_p
);
2766 gdb_assert (ptid_equal (singlestep_ptid
, ecs
->ptid
));
2767 gdb_assert (!ptid_equal (singlestep_ptid
, saved_singlestep_ptid
));
2769 stepping_past_singlestep_breakpoint
= 0;
2771 /* We've either finished single-stepping past the single-step
2772 breakpoint, or stopped for some other reason. It would be nice if
2773 we could tell, but we can't reliably. */
2774 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2777 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping_past_singlestep_breakpoint\n");
2778 /* Pull the single step breakpoints out of the target. */
2779 remove_single_step_breakpoints ();
2780 singlestep_breakpoints_inserted_p
= 0;
2782 ecs
->random_signal
= 0;
2784 context_switch (saved_singlestep_ptid
);
2785 if (deprecated_context_hook
)
2786 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
2788 resume (1, TARGET_SIGNAL_0
);
2789 prepare_to_wait (ecs
);
2794 if (!ptid_equal (deferred_step_ptid
, null_ptid
))
2796 /* In non-stop mode, there's never a deferred_step_ptid set. */
2797 gdb_assert (!non_stop
);
2799 /* If we stopped for some other reason than single-stepping, ignore
2800 the fact that we were supposed to switch back. */
2801 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2804 fprintf_unfiltered (gdb_stdlog
,
2805 "infrun: handling deferred step\n");
2807 /* Pull the single step breakpoints out of the target. */
2808 if (singlestep_breakpoints_inserted_p
)
2810 remove_single_step_breakpoints ();
2811 singlestep_breakpoints_inserted_p
= 0;
2814 /* Note: We do not call context_switch at this point, as the
2815 context is already set up for stepping the original thread. */
2816 switch_to_thread (deferred_step_ptid
);
2817 deferred_step_ptid
= null_ptid
;
2818 /* Suppress spurious "Switching to ..." message. */
2819 previous_inferior_ptid
= inferior_ptid
;
2821 resume (1, TARGET_SIGNAL_0
);
2822 prepare_to_wait (ecs
);
2826 deferred_step_ptid
= null_ptid
;
2829 /* See if a thread hit a thread-specific breakpoint that was meant for
2830 another thread. If so, then step that thread past the breakpoint,
2833 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
2835 int thread_hop_needed
= 0;
2837 /* Check if a regular breakpoint has been hit before checking
2838 for a potential single step breakpoint. Otherwise, GDB will
2839 not see this breakpoint hit when stepping onto breakpoints. */
2840 if (regular_breakpoint_inserted_here_p (stop_pc
))
2842 ecs
->random_signal
= 0;
2843 if (!breakpoint_thread_match (stop_pc
, ecs
->ptid
))
2844 thread_hop_needed
= 1;
2846 else if (singlestep_breakpoints_inserted_p
)
2848 /* We have not context switched yet, so this should be true
2849 no matter which thread hit the singlestep breakpoint. */
2850 gdb_assert (ptid_equal (inferior_ptid
, singlestep_ptid
));
2852 fprintf_unfiltered (gdb_stdlog
, "infrun: software single step "
2854 target_pid_to_str (ecs
->ptid
));
2856 ecs
->random_signal
= 0;
2857 /* The call to in_thread_list is necessary because PTIDs sometimes
2858 change when we go from single-threaded to multi-threaded. If
2859 the singlestep_ptid is still in the list, assume that it is
2860 really different from ecs->ptid. */
2861 if (!ptid_equal (singlestep_ptid
, ecs
->ptid
)
2862 && in_thread_list (singlestep_ptid
))
2864 /* If the PC of the thread we were trying to single-step
2865 has changed, discard this event (which we were going
2866 to ignore anyway), and pretend we saw that thread
2867 trap. This prevents us continuously moving the
2868 single-step breakpoint forward, one instruction at a
2869 time. If the PC has changed, then the thread we were
2870 trying to single-step has trapped or been signalled,
2871 but the event has not been reported to GDB yet.
2873 There might be some cases where this loses signal
2874 information, if a signal has arrived at exactly the
2875 same time that the PC changed, but this is the best
2876 we can do with the information available. Perhaps we
2877 should arrange to report all events for all threads
2878 when they stop, or to re-poll the remote looking for
2879 this particular thread (i.e. temporarily enable
2882 CORE_ADDR new_singlestep_pc
2883 = regcache_read_pc (get_thread_regcache (singlestep_ptid
));
2885 if (new_singlestep_pc
!= singlestep_pc
)
2887 enum target_signal stop_signal
;
2890 fprintf_unfiltered (gdb_stdlog
, "infrun: unexpected thread,"
2891 " but expected thread advanced also\n");
2893 /* The current context still belongs to
2894 singlestep_ptid. Don't swap here, since that's
2895 the context we want to use. Just fudge our
2896 state and continue. */
2897 stop_signal
= ecs
->event_thread
->stop_signal
;
2898 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
2899 ecs
->ptid
= singlestep_ptid
;
2900 ecs
->event_thread
= find_thread_ptid (ecs
->ptid
);
2901 ecs
->event_thread
->stop_signal
= stop_signal
;
2902 stop_pc
= new_singlestep_pc
;
2907 fprintf_unfiltered (gdb_stdlog
,
2908 "infrun: unexpected thread\n");
2910 thread_hop_needed
= 1;
2911 stepping_past_singlestep_breakpoint
= 1;
2912 saved_singlestep_ptid
= singlestep_ptid
;
2917 if (thread_hop_needed
)
2919 struct regcache
*thread_regcache
;
2920 int remove_status
= 0;
2923 fprintf_unfiltered (gdb_stdlog
, "infrun: thread_hop_needed\n");
2925 /* Switch context before touching inferior memory, the
2926 previous thread may have exited. */
2927 if (!ptid_equal (inferior_ptid
, ecs
->ptid
))
2928 context_switch (ecs
->ptid
);
2930 /* Saw a breakpoint, but it was hit by the wrong thread.
2933 if (singlestep_breakpoints_inserted_p
)
2935 /* Pull the single step breakpoints out of the target. */
2936 remove_single_step_breakpoints ();
2937 singlestep_breakpoints_inserted_p
= 0;
2940 /* If the arch can displace step, don't remove the
2942 thread_regcache
= get_thread_regcache (ecs
->ptid
);
2943 if (!use_displaced_stepping (get_regcache_arch (thread_regcache
)))
2944 remove_status
= remove_breakpoints ();
2946 /* Did we fail to remove breakpoints? If so, try
2947 to set the PC past the bp. (There's at least
2948 one situation in which we can fail to remove
2949 the bp's: On HP-UX's that use ttrace, we can't
2950 change the address space of a vforking child
2951 process until the child exits (well, okay, not
2952 then either :-) or execs. */
2953 if (remove_status
!= 0)
2954 error (_("Cannot step over breakpoint hit in wrong thread"));
2959 /* Only need to require the next event from this
2960 thread in all-stop mode. */
2961 waiton_ptid
= ecs
->ptid
;
2962 infwait_state
= infwait_thread_hop_state
;
2965 ecs
->event_thread
->stepping_over_breakpoint
= 1;
2967 registers_changed ();
2971 else if (singlestep_breakpoints_inserted_p
)
2973 sw_single_step_trap_p
= 1;
2974 ecs
->random_signal
= 0;
2978 ecs
->random_signal
= 1;
2980 /* See if something interesting happened to the non-current thread. If
2981 so, then switch to that thread. */
2982 if (!ptid_equal (ecs
->ptid
, inferior_ptid
))
2985 fprintf_unfiltered (gdb_stdlog
, "infrun: context switch\n");
2987 context_switch (ecs
->ptid
);
2989 if (deprecated_context_hook
)
2990 deprecated_context_hook (pid_to_thread_id (ecs
->ptid
));
2993 /* At this point, get hold of the now-current thread's frame. */
2994 frame
= get_current_frame ();
2995 gdbarch
= get_frame_arch (frame
);
2997 if (singlestep_breakpoints_inserted_p
)
2999 /* Pull the single step breakpoints out of the target. */
3000 remove_single_step_breakpoints ();
3001 singlestep_breakpoints_inserted_p
= 0;
3004 if (stepped_after_stopped_by_watchpoint
)
3005 stopped_by_watchpoint
= 0;
3007 stopped_by_watchpoint
= watchpoints_triggered (&ecs
->ws
);
3009 /* If necessary, step over this watchpoint. We'll be back to display
3011 if (stopped_by_watchpoint
3012 && (target_have_steppable_watchpoint
3013 || gdbarch_have_nonsteppable_watchpoint (gdbarch
)))
3015 /* At this point, we are stopped at an instruction which has
3016 attempted to write to a piece of memory under control of
3017 a watchpoint. The instruction hasn't actually executed
3018 yet. If we were to evaluate the watchpoint expression
3019 now, we would get the old value, and therefore no change
3020 would seem to have occurred.
3022 In order to make watchpoints work `right', we really need
3023 to complete the memory write, and then evaluate the
3024 watchpoint expression. We do this by single-stepping the
3027 It may not be necessary to disable the watchpoint to stop over
3028 it. For example, the PA can (with some kernel cooperation)
3029 single step over a watchpoint without disabling the watchpoint.
3031 It is far more common to need to disable a watchpoint to step
3032 the inferior over it. If we have non-steppable watchpoints,
3033 we must disable the current watchpoint; it's simplest to
3034 disable all watchpoints and breakpoints. */
3037 if (!target_have_steppable_watchpoint
)
3038 remove_breakpoints ();
3040 hw_step
= maybe_software_singlestep (gdbarch
, stop_pc
);
3041 target_resume (ecs
->ptid
, hw_step
, TARGET_SIGNAL_0
);
3042 registers_changed ();
3043 waiton_ptid
= ecs
->ptid
;
3044 if (target_have_steppable_watchpoint
)
3045 infwait_state
= infwait_step_watch_state
;
3047 infwait_state
= infwait_nonstep_watch_state
;
3048 prepare_to_wait (ecs
);
3052 ecs
->stop_func_start
= 0;
3053 ecs
->stop_func_end
= 0;
3054 ecs
->stop_func_name
= 0;
3055 /* Don't care about return value; stop_func_start and stop_func_name
3056 will both be 0 if it doesn't work. */
3057 find_pc_partial_function (stop_pc
, &ecs
->stop_func_name
,
3058 &ecs
->stop_func_start
, &ecs
->stop_func_end
);
3059 ecs
->stop_func_start
3060 += gdbarch_deprecated_function_start_offset (gdbarch
);
3061 ecs
->event_thread
->stepping_over_breakpoint
= 0;
3062 bpstat_clear (&ecs
->event_thread
->stop_bpstat
);
3063 ecs
->event_thread
->stop_step
= 0;
3064 stop_print_frame
= 1;
3065 ecs
->random_signal
= 0;
3066 stopped_by_random_signal
= 0;
3068 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
3069 && ecs
->event_thread
->trap_expected
3070 && gdbarch_single_step_through_delay_p (gdbarch
)
3071 && currently_stepping (ecs
->event_thread
))
3073 /* We're trying to step off a breakpoint. Turns out that we're
3074 also on an instruction that needs to be stepped multiple
3075 times before it's been fully executing. E.g., architectures
3076 with a delay slot. It needs to be stepped twice, once for
3077 the instruction and once for the delay slot. */
3078 int step_through_delay
3079 = gdbarch_single_step_through_delay (gdbarch
, frame
);
3080 if (debug_infrun
&& step_through_delay
)
3081 fprintf_unfiltered (gdb_stdlog
, "infrun: step through delay\n");
3082 if (ecs
->event_thread
->step_range_end
== 0 && step_through_delay
)
3084 /* The user issued a continue when stopped at a breakpoint.
3085 Set up for another trap and get out of here. */
3086 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3090 else if (step_through_delay
)
3092 /* The user issued a step when stopped at a breakpoint.
3093 Maybe we should stop, maybe we should not - the delay
3094 slot *might* correspond to a line of source. In any
3095 case, don't decide that here, just set
3096 ecs->stepping_over_breakpoint, making sure we
3097 single-step again before breakpoints are re-inserted. */
3098 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3102 /* Look at the cause of the stop, and decide what to do.
3103 The alternatives are:
3104 1) stop_stepping and return; to really stop and return to the debugger,
3105 2) keep_going and return to start up again
3106 (set ecs->event_thread->stepping_over_breakpoint to 1 to single step once)
3107 3) set ecs->random_signal to 1, and the decision between 1 and 2
3108 will be made according to the signal handling tables. */
3110 /* First, distinguish signals caused by the debugger from signals
3111 that have to do with the program's own actions. Note that
3112 breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
3113 on the operating system version. Here we detect when a SIGILL or
3114 SIGEMT is really a breakpoint and change it to SIGTRAP. We do
3115 something similar for SIGSEGV, since a SIGSEGV will be generated
3116 when we're trying to execute a breakpoint instruction on a
3117 non-executable stack. This happens for call dummy breakpoints
3118 for architectures like SPARC that place call dummies on the
3121 If we're doing a displaced step past a breakpoint, then the
3122 breakpoint is always inserted at the original instruction;
3123 non-standard signals can't be explained by the breakpoint. */
3124 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
3125 || (! ecs
->event_thread
->trap_expected
3126 && breakpoint_inserted_here_p (stop_pc
)
3127 && (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_ILL
3128 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_SEGV
3129 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_EMT
))
3130 || stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_NO_SIGSTOP
3131 || stop_soon
== STOP_QUIETLY_REMOTE
)
3133 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
&& stop_after_trap
)
3136 fprintf_unfiltered (gdb_stdlog
, "infrun: stopped\n");
3137 stop_print_frame
= 0;
3138 stop_stepping (ecs
);
3142 /* This is originated from start_remote(), start_inferior() and
3143 shared libraries hook functions. */
3144 if (stop_soon
== STOP_QUIETLY
|| stop_soon
== STOP_QUIETLY_REMOTE
)
3147 fprintf_unfiltered (gdb_stdlog
, "infrun: quietly stopped\n");
3148 stop_stepping (ecs
);
3152 /* This originates from attach_command(). We need to overwrite
3153 the stop_signal here, because some kernels don't ignore a
3154 SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call.
3155 See more comments in inferior.h. On the other hand, if we
3156 get a non-SIGSTOP, report it to the user - assume the backend
3157 will handle the SIGSTOP if it should show up later.
3159 Also consider that the attach is complete when we see a
3160 SIGTRAP. Some systems (e.g. Windows), and stubs supporting
3161 target extended-remote report it instead of a SIGSTOP
3162 (e.g. gdbserver). We already rely on SIGTRAP being our
3163 signal, so this is no exception.
3165 Also consider that the attach is complete when we see a
3166 TARGET_SIGNAL_0. In non-stop mode, GDB will explicitly tell
3167 the target to stop all threads of the inferior, in case the
3168 low level attach operation doesn't stop them implicitly. If
3169 they weren't stopped implicitly, then the stub will report a
3170 TARGET_SIGNAL_0, meaning: stopped for no particular reason
3171 other than GDB's request. */
3172 if (stop_soon
== STOP_QUIETLY_NO_SIGSTOP
3173 && (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_STOP
3174 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
3175 || ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_0
))
3177 stop_stepping (ecs
);
3178 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
3182 /* See if there is a breakpoint at the current PC. */
3183 ecs
->event_thread
->stop_bpstat
= bpstat_stop_status (stop_pc
, ecs
->ptid
);
3185 /* Following in case break condition called a
3187 stop_print_frame
= 1;
3189 /* NOTE: cagney/2003-03-29: These two checks for a random signal
3190 at one stage in the past included checks for an inferior
3191 function call's call dummy's return breakpoint. The original
3192 comment, that went with the test, read:
3194 ``End of a stack dummy. Some systems (e.g. Sony news) give
3195 another signal besides SIGTRAP, so check here as well as
3198 If someone ever tries to get call dummys on a
3199 non-executable stack to work (where the target would stop
3200 with something like a SIGSEGV), then those tests might need
3201 to be re-instated. Given, however, that the tests were only
3202 enabled when momentary breakpoints were not being used, I
3203 suspect that it won't be the case.
3205 NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
3206 be necessary for call dummies on a non-executable stack on
3209 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
)
3211 = !(bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
)
3212 || ecs
->event_thread
->trap_expected
3213 || (ecs
->event_thread
->step_range_end
3214 && ecs
->event_thread
->step_resume_breakpoint
== NULL
));
3217 ecs
->random_signal
= !bpstat_explains_signal (ecs
->event_thread
->stop_bpstat
);
3218 if (!ecs
->random_signal
)
3219 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_TRAP
;
3223 /* When we reach this point, we've pretty much decided
3224 that the reason for stopping must've been a random
3225 (unexpected) signal. */
3228 ecs
->random_signal
= 1;
3230 process_event_stop_test
:
3232 /* Re-fetch current thread's frame in case we did a
3233 "goto process_event_stop_test" above. */
3234 frame
= get_current_frame ();
3235 gdbarch
= get_frame_arch (frame
);
3237 /* For the program's own signals, act according to
3238 the signal handling tables. */
3240 if (ecs
->random_signal
)
3242 /* Signal not for debugging purposes. */
3246 fprintf_unfiltered (gdb_stdlog
, "infrun: random signal %d\n",
3247 ecs
->event_thread
->stop_signal
);
3249 stopped_by_random_signal
= 1;
3251 if (signal_print
[ecs
->event_thread
->stop_signal
])
3254 target_terminal_ours_for_output ();
3255 print_stop_reason (SIGNAL_RECEIVED
, ecs
->event_thread
->stop_signal
);
3257 /* Always stop on signals if we're either just gaining control
3258 of the program, or the user explicitly requested this thread
3259 to remain stopped. */
3260 if (stop_soon
!= NO_STOP_QUIETLY
3261 || ecs
->event_thread
->stop_requested
3262 || signal_stop_state (ecs
->event_thread
->stop_signal
))
3264 stop_stepping (ecs
);
3267 /* If not going to stop, give terminal back
3268 if we took it away. */
3270 target_terminal_inferior ();
3272 /* Clear the signal if it should not be passed. */
3273 if (signal_program
[ecs
->event_thread
->stop_signal
] == 0)
3274 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
3276 if (ecs
->event_thread
->prev_pc
== stop_pc
3277 && ecs
->event_thread
->trap_expected
3278 && ecs
->event_thread
->step_resume_breakpoint
== NULL
)
3280 /* We were just starting a new sequence, attempting to
3281 single-step off of a breakpoint and expecting a SIGTRAP.
3282 Instead this signal arrives. This signal will take us out
3283 of the stepping range so GDB needs to remember to, when
3284 the signal handler returns, resume stepping off that
3286 /* To simplify things, "continue" is forced to use the same
3287 code paths as single-step - set a breakpoint at the
3288 signal return address and then, once hit, step off that
3291 fprintf_unfiltered (gdb_stdlog
,
3292 "infrun: signal arrived while stepping over "
3295 insert_step_resume_breakpoint_at_frame (frame
);
3296 ecs
->event_thread
->step_after_step_resume_breakpoint
= 1;
3301 if (ecs
->event_thread
->step_range_end
!= 0
3302 && ecs
->event_thread
->stop_signal
!= TARGET_SIGNAL_0
3303 && (ecs
->event_thread
->step_range_start
<= stop_pc
3304 && stop_pc
< ecs
->event_thread
->step_range_end
)
3305 && frame_id_eq (get_frame_id (frame
),
3306 ecs
->event_thread
->step_frame_id
)
3307 && ecs
->event_thread
->step_resume_breakpoint
== NULL
)
3309 /* The inferior is about to take a signal that will take it
3310 out of the single step range. Set a breakpoint at the
3311 current PC (which is presumably where the signal handler
3312 will eventually return) and then allow the inferior to
3315 Note that this is only needed for a signal delivered
3316 while in the single-step range. Nested signals aren't a
3317 problem as they eventually all return. */
3319 fprintf_unfiltered (gdb_stdlog
,
3320 "infrun: signal may take us out of "
3321 "single-step range\n");
3323 insert_step_resume_breakpoint_at_frame (frame
);
3328 /* Note: step_resume_breakpoint may be non-NULL. This occures
3329 when either there's a nested signal, or when there's a
3330 pending signal enabled just as the signal handler returns
3331 (leaving the inferior at the step-resume-breakpoint without
3332 actually executing it). Either way continue until the
3333 breakpoint is really hit. */
3338 /* Handle cases caused by hitting a breakpoint. */
3340 CORE_ADDR jmp_buf_pc
;
3341 struct bpstat_what what
;
3343 what
= bpstat_what (ecs
->event_thread
->stop_bpstat
);
3345 if (what
.call_dummy
)
3347 stop_stack_dummy
= 1;
3350 switch (what
.main_action
)
3352 case BPSTAT_WHAT_SET_LONGJMP_RESUME
:
3353 /* If we hit the breakpoint at longjmp while stepping, we
3354 install a momentary breakpoint at the target of the
3358 fprintf_unfiltered (gdb_stdlog
,
3359 "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n");
3361 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3363 if (!gdbarch_get_longjmp_target_p (gdbarch
)
3364 || !gdbarch_get_longjmp_target (gdbarch
, frame
, &jmp_buf_pc
))
3367 fprintf_unfiltered (gdb_stdlog
, "\
3368 infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME (!gdbarch_get_longjmp_target)\n");
3373 /* We're going to replace the current step-resume breakpoint
3374 with a longjmp-resume breakpoint. */
3375 delete_step_resume_breakpoint (ecs
->event_thread
);
3377 /* Insert a breakpoint at resume address. */
3378 insert_longjmp_resume_breakpoint (jmp_buf_pc
);
3383 case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME
:
3385 fprintf_unfiltered (gdb_stdlog
,
3386 "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n");
3388 gdb_assert (ecs
->event_thread
->step_resume_breakpoint
!= NULL
);
3389 delete_step_resume_breakpoint (ecs
->event_thread
);
3391 ecs
->event_thread
->stop_step
= 1;
3392 print_stop_reason (END_STEPPING_RANGE
, 0);
3393 stop_stepping (ecs
);
3396 case BPSTAT_WHAT_SINGLE
:
3398 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_SINGLE\n");
3399 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3400 /* Still need to check other stuff, at least the case
3401 where we are stepping and step out of the right range. */
3404 case BPSTAT_WHAT_STOP_NOISY
:
3406 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_NOISY\n");
3407 stop_print_frame
= 1;
3409 /* We are about to nuke the step_resume_breakpointt via the
3410 cleanup chain, so no need to worry about it here. */
3412 stop_stepping (ecs
);
3415 case BPSTAT_WHAT_STOP_SILENT
:
3417 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STOP_SILENT\n");
3418 stop_print_frame
= 0;
3420 /* We are about to nuke the step_resume_breakpoin via the
3421 cleanup chain, so no need to worry about it here. */
3423 stop_stepping (ecs
);
3426 case BPSTAT_WHAT_STEP_RESUME
:
3428 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_STEP_RESUME\n");
3430 delete_step_resume_breakpoint (ecs
->event_thread
);
3431 if (ecs
->event_thread
->step_after_step_resume_breakpoint
)
3433 /* Back when the step-resume breakpoint was inserted, we
3434 were trying to single-step off a breakpoint. Go back
3436 ecs
->event_thread
->step_after_step_resume_breakpoint
= 0;
3437 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3441 if (stop_pc
== ecs
->stop_func_start
3442 && execution_direction
== EXEC_REVERSE
)
3444 /* We are stepping over a function call in reverse, and
3445 just hit the step-resume breakpoint at the start
3446 address of the function. Go back to single-stepping,
3447 which should take us back to the function call. */
3448 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3454 case BPSTAT_WHAT_CHECK_SHLIBS
:
3457 fprintf_unfiltered (gdb_stdlog
, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n");
3459 /* Check for any newly added shared libraries if we're
3460 supposed to be adding them automatically. Switch
3461 terminal for any messages produced by
3462 breakpoint_re_set. */
3463 target_terminal_ours_for_output ();
3464 /* NOTE: cagney/2003-11-25: Make certain that the target
3465 stack's section table is kept up-to-date. Architectures,
3466 (e.g., PPC64), use the section table to perform
3467 operations such as address => section name and hence
3468 require the table to contain all sections (including
3469 those found in shared libraries). */
3471 SOLIB_ADD (NULL
, 0, ¤t_target
, auto_solib_add
);
3473 solib_add (NULL
, 0, ¤t_target
, auto_solib_add
);
3475 target_terminal_inferior ();
3477 /* If requested, stop when the dynamic linker notifies
3478 gdb of events. This allows the user to get control
3479 and place breakpoints in initializer routines for
3480 dynamically loaded objects (among other things). */
3481 if (stop_on_solib_events
|| stop_stack_dummy
)
3483 stop_stepping (ecs
);
3488 /* We want to step over this breakpoint, then keep going. */
3489 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3495 case BPSTAT_WHAT_LAST
:
3496 /* Not a real code, but listed here to shut up gcc -Wall. */
3498 case BPSTAT_WHAT_KEEP_CHECKING
:
3503 /* We come here if we hit a breakpoint but should not
3504 stop for it. Possibly we also were stepping
3505 and should stop for that. So fall through and
3506 test for stepping. But, if not stepping,
3509 /* In all-stop mode, if we're currently stepping but have stopped in
3510 some other thread, we need to switch back to the stepped thread. */
3513 struct thread_info
*tp
;
3514 tp
= iterate_over_threads (currently_stepping_or_nexting_callback
,
3518 /* However, if the current thread is blocked on some internal
3519 breakpoint, and we simply need to step over that breakpoint
3520 to get it going again, do that first. */
3521 if ((ecs
->event_thread
->trap_expected
3522 && ecs
->event_thread
->stop_signal
!= TARGET_SIGNAL_TRAP
)
3523 || ecs
->event_thread
->stepping_over_breakpoint
)
3529 /* If the stepping thread exited, then don't try to switch
3530 back and resume it, which could fail in several different
3531 ways depending on the target. Instead, just keep going.
3533 We can find a stepping dead thread in the thread list in
3536 - The target supports thread exit events, and when the
3537 target tries to delete the thread from the thread list,
3538 inferior_ptid pointed at the exiting thread. In such
3539 case, calling delete_thread does not really remove the
3540 thread from the list; instead, the thread is left listed,
3541 with 'exited' state.
3543 - The target's debug interface does not support thread
3544 exit events, and so we have no idea whatsoever if the
3545 previously stepping thread is still alive. For that
3546 reason, we need to synchronously query the target
3548 if (is_exited (tp
->ptid
)
3549 || !target_thread_alive (tp
->ptid
))
3552 fprintf_unfiltered (gdb_stdlog
, "\
3553 infrun: not switching back to stepped thread, it has vanished\n");
3555 delete_thread (tp
->ptid
);
3560 /* Otherwise, we no longer expect a trap in the current thread.
3561 Clear the trap_expected flag before switching back -- this is
3562 what keep_going would do as well, if we called it. */
3563 ecs
->event_thread
->trap_expected
= 0;
3566 fprintf_unfiltered (gdb_stdlog
,
3567 "infrun: switching back to stepped thread\n");
3569 ecs
->event_thread
= tp
;
3570 ecs
->ptid
= tp
->ptid
;
3571 context_switch (ecs
->ptid
);
3577 /* Are we stepping to get the inferior out of the dynamic linker's
3578 hook (and possibly the dld itself) after catching a shlib
3580 if (ecs
->event_thread
->stepping_through_solib_after_catch
)
3582 #if defined(SOLIB_ADD)
3583 /* Have we reached our destination? If not, keep going. */
3584 if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs
->ptid
), stop_pc
))
3587 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping in dynamic linker\n");
3588 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3594 fprintf_unfiltered (gdb_stdlog
, "infrun: step past dynamic linker\n");
3595 /* Else, stop and report the catchpoint(s) whose triggering
3596 caused us to begin stepping. */
3597 ecs
->event_thread
->stepping_through_solib_after_catch
= 0;
3598 bpstat_clear (&ecs
->event_thread
->stop_bpstat
);
3599 ecs
->event_thread
->stop_bpstat
3600 = bpstat_copy (ecs
->event_thread
->stepping_through_solib_catchpoints
);
3601 bpstat_clear (&ecs
->event_thread
->stepping_through_solib_catchpoints
);
3602 stop_print_frame
= 1;
3603 stop_stepping (ecs
);
3607 if (ecs
->event_thread
->step_resume_breakpoint
)
3610 fprintf_unfiltered (gdb_stdlog
,
3611 "infrun: step-resume breakpoint is inserted\n");
3613 /* Having a step-resume breakpoint overrides anything
3614 else having to do with stepping commands until
3615 that breakpoint is reached. */
3620 if (ecs
->event_thread
->step_range_end
== 0)
3623 fprintf_unfiltered (gdb_stdlog
, "infrun: no stepping, continue\n");
3624 /* Likewise if we aren't even stepping. */
3629 /* If stepping through a line, keep going if still within it.
3631 Note that step_range_end is the address of the first instruction
3632 beyond the step range, and NOT the address of the last instruction
3635 Note also that during reverse execution, we may be stepping
3636 through a function epilogue and therefore must detect when
3637 the current-frame changes in the middle of a line. */
3639 if (stop_pc
>= ecs
->event_thread
->step_range_start
3640 && stop_pc
< ecs
->event_thread
->step_range_end
3641 && (execution_direction
!= EXEC_REVERSE
3642 || frame_id_eq (get_frame_id (get_current_frame ()),
3643 ecs
->event_thread
->step_frame_id
)))
3646 fprintf_unfiltered (gdb_stdlog
, "infrun: stepping inside range [0x%s-0x%s]\n",
3647 paddr_nz (ecs
->event_thread
->step_range_start
),
3648 paddr_nz (ecs
->event_thread
->step_range_end
));
3650 /* When stepping backward, stop at beginning of line range
3651 (unless it's the function entry point, in which case
3652 keep going back to the call point). */
3653 if (stop_pc
== ecs
->event_thread
->step_range_start
3654 && stop_pc
!= ecs
->stop_func_start
3655 && execution_direction
== EXEC_REVERSE
)
3657 ecs
->event_thread
->stop_step
= 1;
3658 print_stop_reason (END_STEPPING_RANGE
, 0);
3659 stop_stepping (ecs
);
3667 /* We stepped out of the stepping range. */
3669 /* If we are stepping at the source level and entered the runtime
3670 loader dynamic symbol resolution code, we keep on single stepping
3671 until we exit the run time loader code and reach the callee's
3673 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3674 && in_solib_dynsym_resolve_code (stop_pc
))
3676 CORE_ADDR pc_after_resolver
=
3677 gdbarch_skip_solib_resolver (gdbarch
, stop_pc
);
3680 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into dynsym resolve code\n");
3682 if (pc_after_resolver
)
3684 /* Set up a step-resume breakpoint at the address
3685 indicated by SKIP_SOLIB_RESOLVER. */
3686 struct symtab_and_line sr_sal
;
3688 sr_sal
.pc
= pc_after_resolver
;
3690 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3697 if (ecs
->event_thread
->step_range_end
!= 1
3698 && (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3699 || ecs
->event_thread
->step_over_calls
== STEP_OVER_ALL
)
3700 && get_frame_type (frame
) == SIGTRAMP_FRAME
)
3703 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into signal trampoline\n");
3704 /* The inferior, while doing a "step" or "next", has ended up in
3705 a signal trampoline (either by a signal being delivered or by
3706 the signal handler returning). Just single-step until the
3707 inferior leaves the trampoline (either by calling the handler
3713 /* Check for subroutine calls. The check for the current frame
3714 equalling the step ID is not necessary - the check of the
3715 previous frame's ID is sufficient - but it is a common case and
3716 cheaper than checking the previous frame's ID.
3718 NOTE: frame_id_eq will never report two invalid frame IDs as
3719 being equal, so to get into this block, both the current and
3720 previous frame must have valid frame IDs. */
3721 if (!frame_id_eq (get_frame_id (frame
),
3722 ecs
->event_thread
->step_frame_id
)
3723 && (frame_id_eq (frame_unwind_id (frame
),
3724 ecs
->event_thread
->step_frame_id
)
3725 || execution_direction
== EXEC_REVERSE
))
3727 CORE_ADDR real_stop_pc
;
3730 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into subroutine\n");
3732 if ((ecs
->event_thread
->step_over_calls
== STEP_OVER_NONE
)
3733 || ((ecs
->event_thread
->step_range_end
== 1)
3734 && in_prologue (gdbarch
, ecs
->event_thread
->prev_pc
,
3735 ecs
->stop_func_start
)))
3737 /* I presume that step_over_calls is only 0 when we're
3738 supposed to be stepping at the assembly language level
3739 ("stepi"). Just stop. */
3740 /* Also, maybe we just did a "nexti" inside a prolog, so we
3741 thought it was a subroutine call but it was not. Stop as
3743 ecs
->event_thread
->stop_step
= 1;
3744 print_stop_reason (END_STEPPING_RANGE
, 0);
3745 stop_stepping (ecs
);
3749 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_ALL
)
3751 /* We're doing a "next".
3753 Normal (forward) execution: set a breakpoint at the
3754 callee's return address (the address at which the caller
3757 Reverse (backward) execution. set the step-resume
3758 breakpoint at the start of the function that we just
3759 stepped into (backwards), and continue to there. When we
3760 get there, we'll need to single-step back to the caller. */
3762 if (execution_direction
== EXEC_REVERSE
)
3764 struct symtab_and_line sr_sal
;
3766 if (ecs
->stop_func_start
== 0
3767 && in_solib_dynsym_resolve_code (stop_pc
))
3769 /* Stepped into runtime loader dynamic symbol
3770 resolution code. Since we're in reverse,
3771 we have already backed up through the runtime
3772 loader and the dynamic function. This is just
3773 the trampoline (jump table).
3775 Just keep stepping, we'll soon be home.
3780 if (gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
))
3782 /* We are in a function call trampoline.
3783 Keep stepping backward to get to the caller. */
3784 ecs
->event_thread
->stepping_over_breakpoint
= 1;
3788 /* Normal function call return (static or dynamic). */
3790 sr_sal
.pc
= ecs
->stop_func_start
;
3791 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3795 insert_step_resume_breakpoint_at_caller (frame
);
3801 /* If we are in a function call trampoline (a stub between the
3802 calling routine and the real function), locate the real
3803 function. That's what tells us (a) whether we want to step
3804 into it at all, and (b) what prologue we want to run to the
3805 end of, if we do step into it. */
3806 real_stop_pc
= skip_language_trampoline (frame
, stop_pc
);
3807 if (real_stop_pc
== 0)
3808 real_stop_pc
= gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
);
3809 if (real_stop_pc
!= 0)
3810 ecs
->stop_func_start
= real_stop_pc
;
3812 if (real_stop_pc
!= 0 && in_solib_dynsym_resolve_code (real_stop_pc
))
3814 struct symtab_and_line sr_sal
;
3816 sr_sal
.pc
= ecs
->stop_func_start
;
3818 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3823 /* If we have line number information for the function we are
3824 thinking of stepping into, step into it.
3826 If there are several symtabs at that PC (e.g. with include
3827 files), just want to know whether *any* of them have line
3828 numbers. find_pc_line handles this. */
3830 struct symtab_and_line tmp_sal
;
3832 tmp_sal
= find_pc_line (ecs
->stop_func_start
, 0);
3833 if (tmp_sal
.line
!= 0)
3835 if (execution_direction
== EXEC_REVERSE
)
3836 handle_step_into_function_backward (gdbarch
, ecs
);
3838 handle_step_into_function (gdbarch
, ecs
);
3843 /* If we have no line number and the step-stop-if-no-debug is
3844 set, we stop the step so that the user has a chance to switch
3845 in assembly mode. */
3846 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3847 && step_stop_if_no_debug
)
3849 ecs
->event_thread
->stop_step
= 1;
3850 print_stop_reason (END_STEPPING_RANGE
, 0);
3851 stop_stepping (ecs
);
3855 if (execution_direction
== EXEC_REVERSE
)
3857 /* Set a breakpoint at callee's start address.
3858 From there we can step once and be back in the caller. */
3859 struct symtab_and_line sr_sal
;
3861 sr_sal
.pc
= ecs
->stop_func_start
;
3862 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3865 /* Set a breakpoint at callee's return address (the address
3866 at which the caller will resume). */
3867 insert_step_resume_breakpoint_at_caller (frame
);
3873 /* If we're in the return path from a shared library trampoline,
3874 we want to proceed through the trampoline when stepping. */
3875 if (gdbarch_in_solib_return_trampoline (gdbarch
,
3876 stop_pc
, ecs
->stop_func_name
))
3878 /* Determine where this trampoline returns. */
3879 CORE_ADDR real_stop_pc
;
3880 real_stop_pc
= gdbarch_skip_trampoline_code (gdbarch
, frame
, stop_pc
);
3883 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into solib return tramp\n");
3885 /* Only proceed through if we know where it's going. */
3888 /* And put the step-breakpoint there and go until there. */
3889 struct symtab_and_line sr_sal
;
3891 init_sal (&sr_sal
); /* initialize to zeroes */
3892 sr_sal
.pc
= real_stop_pc
;
3893 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
3895 /* Do not specify what the fp should be when we stop since
3896 on some machines the prologue is where the new fp value
3898 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
3900 /* Restart without fiddling with the step ranges or
3907 stop_pc_sal
= find_pc_line (stop_pc
, 0);
3909 /* NOTE: tausq/2004-05-24: This if block used to be done before all
3910 the trampoline processing logic, however, there are some trampolines
3911 that have no names, so we should do trampoline handling first. */
3912 if (ecs
->event_thread
->step_over_calls
== STEP_OVER_UNDEBUGGABLE
3913 && ecs
->stop_func_name
== NULL
3914 && stop_pc_sal
.line
== 0)
3917 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped into undebuggable function\n");
3919 /* The inferior just stepped into, or returned to, an
3920 undebuggable function (where there is no debugging information
3921 and no line number corresponding to the address where the
3922 inferior stopped). Since we want to skip this kind of code,
3923 we keep going until the inferior returns from this
3924 function - unless the user has asked us not to (via
3925 set step-mode) or we no longer know how to get back
3926 to the call site. */
3927 if (step_stop_if_no_debug
3928 || !frame_id_p (frame_unwind_id (frame
)))
3930 /* If we have no line number and the step-stop-if-no-debug
3931 is set, we stop the step so that the user has a chance to
3932 switch in assembly mode. */
3933 ecs
->event_thread
->stop_step
= 1;
3934 print_stop_reason (END_STEPPING_RANGE
, 0);
3935 stop_stepping (ecs
);
3940 /* Set a breakpoint at callee's return address (the address
3941 at which the caller will resume). */
3942 insert_step_resume_breakpoint_at_caller (frame
);
3948 if (ecs
->event_thread
->step_range_end
== 1)
3950 /* It is stepi or nexti. We always want to stop stepping after
3953 fprintf_unfiltered (gdb_stdlog
, "infrun: stepi/nexti\n");
3954 ecs
->event_thread
->stop_step
= 1;
3955 print_stop_reason (END_STEPPING_RANGE
, 0);
3956 stop_stepping (ecs
);
3960 if (stop_pc_sal
.line
== 0)
3962 /* We have no line number information. That means to stop
3963 stepping (does this always happen right after one instruction,
3964 when we do "s" in a function with no line numbers,
3965 or can this happen as a result of a return or longjmp?). */
3967 fprintf_unfiltered (gdb_stdlog
, "infrun: no line number info\n");
3968 ecs
->event_thread
->stop_step
= 1;
3969 print_stop_reason (END_STEPPING_RANGE
, 0);
3970 stop_stepping (ecs
);
3974 if ((stop_pc
== stop_pc_sal
.pc
)
3975 && (ecs
->event_thread
->current_line
!= stop_pc_sal
.line
3976 || ecs
->event_thread
->current_symtab
!= stop_pc_sal
.symtab
))
3978 /* We are at the start of a different line. So stop. Note that
3979 we don't stop if we step into the middle of a different line.
3980 That is said to make things like for (;;) statements work
3983 fprintf_unfiltered (gdb_stdlog
, "infrun: stepped to a different line\n");
3984 ecs
->event_thread
->stop_step
= 1;
3985 print_stop_reason (END_STEPPING_RANGE
, 0);
3986 stop_stepping (ecs
);
3990 /* We aren't done stepping.
3992 Optimize by setting the stepping range to the line.
3993 (We might not be in the original line, but if we entered a
3994 new line in mid-statement, we continue stepping. This makes
3995 things like for(;;) statements work better.) */
3997 ecs
->event_thread
->step_range_start
= stop_pc_sal
.pc
;
3998 ecs
->event_thread
->step_range_end
= stop_pc_sal
.end
;
3999 ecs
->event_thread
->step_frame_id
= get_frame_id (frame
);
4000 ecs
->event_thread
->current_line
= stop_pc_sal
.line
;
4001 ecs
->event_thread
->current_symtab
= stop_pc_sal
.symtab
;
4004 fprintf_unfiltered (gdb_stdlog
, "infrun: keep going\n");
4008 /* Is thread TP in the middle of single-stepping? */
4011 currently_stepping (struct thread_info
*tp
)
4013 return ((tp
->step_range_end
&& tp
->step_resume_breakpoint
== NULL
)
4014 || tp
->trap_expected
4015 || tp
->stepping_through_solib_after_catch
4016 || bpstat_should_step ());
4019 /* Returns true if any thread *but* the one passed in "data" is in the
4020 middle of stepping or of handling a "next". */
4023 currently_stepping_or_nexting_callback (struct thread_info
*tp
, void *data
)
4028 return (tp
->step_range_end
4029 || tp
->trap_expected
4030 || tp
->stepping_through_solib_after_catch
);
4033 /* Inferior has stepped into a subroutine call with source code that
4034 we should not step over. Do step to the first line of code in
4038 handle_step_into_function (struct gdbarch
*gdbarch
,
4039 struct execution_control_state
*ecs
)
4042 struct symtab_and_line stop_func_sal
, sr_sal
;
4044 s
= find_pc_symtab (stop_pc
);
4045 if (s
&& s
->language
!= language_asm
)
4046 ecs
->stop_func_start
= gdbarch_skip_prologue (gdbarch
,
4047 ecs
->stop_func_start
);
4049 stop_func_sal
= find_pc_line (ecs
->stop_func_start
, 0);
4050 /* Use the step_resume_break to step until the end of the prologue,
4051 even if that involves jumps (as it seems to on the vax under
4053 /* If the prologue ends in the middle of a source line, continue to
4054 the end of that source line (if it is still within the function).
4055 Otherwise, just go to end of prologue. */
4056 if (stop_func_sal
.end
4057 && stop_func_sal
.pc
!= ecs
->stop_func_start
4058 && stop_func_sal
.end
< ecs
->stop_func_end
)
4059 ecs
->stop_func_start
= stop_func_sal
.end
;
4061 /* Architectures which require breakpoint adjustment might not be able
4062 to place a breakpoint at the computed address. If so, the test
4063 ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
4064 ecs->stop_func_start to an address at which a breakpoint may be
4065 legitimately placed.
4067 Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
4068 made, GDB will enter an infinite loop when stepping through
4069 optimized code consisting of VLIW instructions which contain
4070 subinstructions corresponding to different source lines. On
4071 FR-V, it's not permitted to place a breakpoint on any but the
4072 first subinstruction of a VLIW instruction. When a breakpoint is
4073 set, GDB will adjust the breakpoint address to the beginning of
4074 the VLIW instruction. Thus, we need to make the corresponding
4075 adjustment here when computing the stop address. */
4077 if (gdbarch_adjust_breakpoint_address_p (gdbarch
))
4079 ecs
->stop_func_start
4080 = gdbarch_adjust_breakpoint_address (gdbarch
,
4081 ecs
->stop_func_start
);
4084 if (ecs
->stop_func_start
== stop_pc
)
4086 /* We are already there: stop now. */
4087 ecs
->event_thread
->stop_step
= 1;
4088 print_stop_reason (END_STEPPING_RANGE
, 0);
4089 stop_stepping (ecs
);
4094 /* Put the step-breakpoint there and go until there. */
4095 init_sal (&sr_sal
); /* initialize to zeroes */
4096 sr_sal
.pc
= ecs
->stop_func_start
;
4097 sr_sal
.section
= find_pc_overlay (ecs
->stop_func_start
);
4099 /* Do not specify what the fp should be when we stop since on
4100 some machines the prologue is where the new fp value is
4102 insert_step_resume_breakpoint_at_sal (sr_sal
, null_frame_id
);
4104 /* And make sure stepping stops right away then. */
4105 ecs
->event_thread
->step_range_end
= ecs
->event_thread
->step_range_start
;
4110 /* Inferior has stepped backward into a subroutine call with source
4111 code that we should not step over. Do step to the beginning of the
4112 last line of code in it. */
4115 handle_step_into_function_backward (struct gdbarch
*gdbarch
,
4116 struct execution_control_state
*ecs
)
4119 struct symtab_and_line stop_func_sal
, sr_sal
;
4121 s
= find_pc_symtab (stop_pc
);
4122 if (s
&& s
->language
!= language_asm
)
4123 ecs
->stop_func_start
= gdbarch_skip_prologue (gdbarch
,
4124 ecs
->stop_func_start
);
4126 stop_func_sal
= find_pc_line (stop_pc
, 0);
4128 /* OK, we're just going to keep stepping here. */
4129 if (stop_func_sal
.pc
== stop_pc
)
4131 /* We're there already. Just stop stepping now. */
4132 ecs
->event_thread
->stop_step
= 1;
4133 print_stop_reason (END_STEPPING_RANGE
, 0);
4134 stop_stepping (ecs
);
4138 /* Else just reset the step range and keep going.
4139 No step-resume breakpoint, they don't work for
4140 epilogues, which can have multiple entry paths. */
4141 ecs
->event_thread
->step_range_start
= stop_func_sal
.pc
;
4142 ecs
->event_thread
->step_range_end
= stop_func_sal
.end
;
4148 /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID.
4149 This is used to both functions and to skip over code. */
4152 insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal
,
4153 struct frame_id sr_id
)
4155 /* There should never be more than one step-resume or longjmp-resume
4156 breakpoint per thread, so we should never be setting a new
4157 step_resume_breakpoint when one is already active. */
4158 gdb_assert (inferior_thread ()->step_resume_breakpoint
== NULL
);
4161 fprintf_unfiltered (gdb_stdlog
,
4162 "infrun: inserting step-resume breakpoint at 0x%s\n",
4163 paddr_nz (sr_sal
.pc
));
4165 inferior_thread ()->step_resume_breakpoint
4166 = set_momentary_breakpoint (sr_sal
, sr_id
, bp_step_resume
);
4169 /* Insert a "step-resume breakpoint" at RETURN_FRAME.pc. This is used
4170 to skip a potential signal handler.
4172 This is called with the interrupted function's frame. The signal
4173 handler, when it returns, will resume the interrupted function at
4177 insert_step_resume_breakpoint_at_frame (struct frame_info
*return_frame
)
4179 struct gdbarch
*gdbarch
= get_frame_arch (return_frame
);
4180 struct symtab_and_line sr_sal
;
4182 gdb_assert (return_frame
!= NULL
);
4183 init_sal (&sr_sal
); /* initialize to zeros */
4185 sr_sal
.pc
= gdbarch_addr_bits_remove (gdbarch
, get_frame_pc (return_frame
));
4186 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
4188 insert_step_resume_breakpoint_at_sal (sr_sal
, get_frame_id (return_frame
));
4191 /* Similar to insert_step_resume_breakpoint_at_frame, except
4192 but a breakpoint at the previous frame's PC. This is used to
4193 skip a function after stepping into it (for "next" or if the called
4194 function has no debugging information).
4196 The current function has almost always been reached by single
4197 stepping a call or return instruction. NEXT_FRAME belongs to the
4198 current function, and the breakpoint will be set at the caller's
4201 This is a separate function rather than reusing
4202 insert_step_resume_breakpoint_at_frame in order to avoid
4203 get_prev_frame, which may stop prematurely (see the implementation
4204 of frame_unwind_id for an example). */
4207 insert_step_resume_breakpoint_at_caller (struct frame_info
*next_frame
)
4209 struct gdbarch
*gdbarch
= get_frame_arch (next_frame
);
4210 struct symtab_and_line sr_sal
;
4212 /* We shouldn't have gotten here if we don't know where the call site
4214 gdb_assert (frame_id_p (frame_unwind_id (next_frame
)));
4216 init_sal (&sr_sal
); /* initialize to zeros */
4218 sr_sal
.pc
= gdbarch_addr_bits_remove (gdbarch
, frame_pc_unwind (next_frame
));
4219 sr_sal
.section
= find_pc_overlay (sr_sal
.pc
);
4221 insert_step_resume_breakpoint_at_sal (sr_sal
, frame_unwind_id (next_frame
));
4224 /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a
4225 new breakpoint at the target of a jmp_buf. The handling of
4226 longjmp-resume uses the same mechanisms used for handling
4227 "step-resume" breakpoints. */
4230 insert_longjmp_resume_breakpoint (CORE_ADDR pc
)
4232 /* There should never be more than one step-resume or longjmp-resume
4233 breakpoint per thread, so we should never be setting a new
4234 longjmp_resume_breakpoint when one is already active. */
4235 gdb_assert (inferior_thread ()->step_resume_breakpoint
== NULL
);
4238 fprintf_unfiltered (gdb_stdlog
,
4239 "infrun: inserting longjmp-resume breakpoint at 0x%s\n",
4242 inferior_thread ()->step_resume_breakpoint
=
4243 set_momentary_breakpoint_at_pc (pc
, bp_longjmp_resume
);
4247 stop_stepping (struct execution_control_state
*ecs
)
4250 fprintf_unfiltered (gdb_stdlog
, "infrun: stop_stepping\n");
4252 /* Let callers know we don't want to wait for the inferior anymore. */
4253 ecs
->wait_some_more
= 0;
4256 /* This function handles various cases where we need to continue
4257 waiting for the inferior. */
4258 /* (Used to be the keep_going: label in the old wait_for_inferior) */
4261 keep_going (struct execution_control_state
*ecs
)
4263 /* Save the pc before execution, to compare with pc after stop. */
4264 ecs
->event_thread
->prev_pc
4265 = regcache_read_pc (get_thread_regcache (ecs
->ptid
));
4267 /* If we did not do break;, it means we should keep running the
4268 inferior and not return to debugger. */
4270 if (ecs
->event_thread
->trap_expected
4271 && ecs
->event_thread
->stop_signal
!= TARGET_SIGNAL_TRAP
)
4273 /* We took a signal (which we are supposed to pass through to
4274 the inferior, else we'd not get here) and we haven't yet
4275 gotten our trap. Simply continue. */
4276 resume (currently_stepping (ecs
->event_thread
),
4277 ecs
->event_thread
->stop_signal
);
4281 /* Either the trap was not expected, but we are continuing
4282 anyway (the user asked that this signal be passed to the
4285 The signal was SIGTRAP, e.g. it was our signal, but we
4286 decided we should resume from it.
4288 We're going to run this baby now!
4290 Note that insert_breakpoints won't try to re-insert
4291 already inserted breakpoints. Therefore, we don't
4292 care if breakpoints were already inserted, or not. */
4294 if (ecs
->event_thread
->stepping_over_breakpoint
)
4296 struct regcache
*thread_regcache
= get_thread_regcache (ecs
->ptid
);
4297 if (!use_displaced_stepping (get_regcache_arch (thread_regcache
)))
4298 /* Since we can't do a displaced step, we have to remove
4299 the breakpoint while we step it. To keep things
4300 simple, we remove them all. */
4301 remove_breakpoints ();
4305 struct gdb_exception e
;
4306 /* Stop stepping when inserting breakpoints
4308 TRY_CATCH (e
, RETURN_MASK_ERROR
)
4310 insert_breakpoints ();
4314 stop_stepping (ecs
);
4319 ecs
->event_thread
->trap_expected
= ecs
->event_thread
->stepping_over_breakpoint
;
4321 /* Do not deliver SIGNAL_TRAP (except when the user explicitly
4322 specifies that such a signal should be delivered to the
4325 Typically, this would occure when a user is debugging a
4326 target monitor on a simulator: the target monitor sets a
4327 breakpoint; the simulator encounters this break-point and
4328 halts the simulation handing control to GDB; GDB, noteing
4329 that the break-point isn't valid, returns control back to the
4330 simulator; the simulator then delivers the hardware
4331 equivalent of a SIGNAL_TRAP to the program being debugged. */
4333 if (ecs
->event_thread
->stop_signal
== TARGET_SIGNAL_TRAP
4334 && !signal_program
[ecs
->event_thread
->stop_signal
])
4335 ecs
->event_thread
->stop_signal
= TARGET_SIGNAL_0
;
4337 resume (currently_stepping (ecs
->event_thread
),
4338 ecs
->event_thread
->stop_signal
);
4341 prepare_to_wait (ecs
);
4344 /* This function normally comes after a resume, before
4345 handle_inferior_event exits. It takes care of any last bits of
4346 housekeeping, and sets the all-important wait_some_more flag. */
4349 prepare_to_wait (struct execution_control_state
*ecs
)
4352 fprintf_unfiltered (gdb_stdlog
, "infrun: prepare_to_wait\n");
4353 if (infwait_state
== infwait_normal_state
)
4355 overlay_cache_invalid
= 1;
4357 /* We have to invalidate the registers BEFORE calling
4358 target_wait because they can be loaded from the target while
4359 in target_wait. This makes remote debugging a bit more
4360 efficient for those targets that provide critical registers
4361 as part of their normal status mechanism. */
4363 registers_changed ();
4364 waiton_ptid
= pid_to_ptid (-1);
4366 /* This is the old end of the while loop. Let everybody know we
4367 want to wait for the inferior some more and get called again
4369 ecs
->wait_some_more
= 1;
4372 /* Print why the inferior has stopped. We always print something when
4373 the inferior exits, or receives a signal. The rest of the cases are
4374 dealt with later on in normal_stop() and print_it_typical(). Ideally
4375 there should be a call to this function from handle_inferior_event()
4376 each time stop_stepping() is called.*/
4378 print_stop_reason (enum inferior_stop_reason stop_reason
, int stop_info
)
4380 switch (stop_reason
)
4382 case END_STEPPING_RANGE
:
4383 /* We are done with a step/next/si/ni command. */
4384 /* For now print nothing. */
4385 /* Print a message only if not in the middle of doing a "step n"
4386 operation for n > 1 */
4387 if (!inferior_thread ()->step_multi
4388 || !inferior_thread ()->stop_step
)
4389 if (ui_out_is_mi_like_p (uiout
))
4392 async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE
));
4395 /* The inferior was terminated by a signal. */
4396 annotate_signalled ();
4397 if (ui_out_is_mi_like_p (uiout
))
4400 async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED
));
4401 ui_out_text (uiout
, "\nProgram terminated with signal ");
4402 annotate_signal_name ();
4403 ui_out_field_string (uiout
, "signal-name",
4404 target_signal_to_name (stop_info
));
4405 annotate_signal_name_end ();
4406 ui_out_text (uiout
, ", ");
4407 annotate_signal_string ();
4408 ui_out_field_string (uiout
, "signal-meaning",
4409 target_signal_to_string (stop_info
));
4410 annotate_signal_string_end ();
4411 ui_out_text (uiout
, ".\n");
4412 ui_out_text (uiout
, "The program no longer exists.\n");
4415 /* The inferior program is finished. */
4416 annotate_exited (stop_info
);
4419 if (ui_out_is_mi_like_p (uiout
))
4420 ui_out_field_string (uiout
, "reason",
4421 async_reason_lookup (EXEC_ASYNC_EXITED
));
4422 ui_out_text (uiout
, "\nProgram exited with code ");
4423 ui_out_field_fmt (uiout
, "exit-code", "0%o",
4424 (unsigned int) stop_info
);
4425 ui_out_text (uiout
, ".\n");
4429 if (ui_out_is_mi_like_p (uiout
))
4432 async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY
));
4433 ui_out_text (uiout
, "\nProgram exited normally.\n");
4435 /* Support the --return-child-result option. */
4436 return_child_result_value
= stop_info
;
4438 case SIGNAL_RECEIVED
:
4439 /* Signal received. The signal table tells us to print about
4443 if (stop_info
== TARGET_SIGNAL_0
&& !ui_out_is_mi_like_p (uiout
))
4445 struct thread_info
*t
= inferior_thread ();
4447 ui_out_text (uiout
, "\n[");
4448 ui_out_field_string (uiout
, "thread-name",
4449 target_pid_to_str (t
->ptid
));
4450 ui_out_field_fmt (uiout
, "thread-id", "] #%d", t
->num
);
4451 ui_out_text (uiout
, " stopped");
4455 ui_out_text (uiout
, "\nProgram received signal ");
4456 annotate_signal_name ();
4457 if (ui_out_is_mi_like_p (uiout
))
4459 (uiout
, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED
));
4460 ui_out_field_string (uiout
, "signal-name",
4461 target_signal_to_name (stop_info
));
4462 annotate_signal_name_end ();
4463 ui_out_text (uiout
, ", ");
4464 annotate_signal_string ();
4465 ui_out_field_string (uiout
, "signal-meaning",
4466 target_signal_to_string (stop_info
));
4467 annotate_signal_string_end ();
4469 ui_out_text (uiout
, ".\n");
4472 /* Reverse execution: target ran out of history info. */
4473 ui_out_text (uiout
, "\nNo more reverse-execution history.\n");
4476 internal_error (__FILE__
, __LINE__
,
4477 _("print_stop_reason: unrecognized enum value"));
4483 /* Here to return control to GDB when the inferior stops for real.
4484 Print appropriate messages, remove breakpoints, give terminal our modes.
4486 STOP_PRINT_FRAME nonzero means print the executing frame
4487 (pc, function, args, file, line number and line text).
4488 BREAKPOINTS_FAILED nonzero means stop was due to error
4489 attempting to insert breakpoints. */
4494 struct target_waitstatus last
;
4496 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
4498 get_last_target_status (&last_ptid
, &last
);
4500 /* If an exception is thrown from this point on, make sure to
4501 propagate GDB's knowledge of the executing state to the
4502 frontend/user running state. A QUIT is an easy exception to see
4503 here, so do this before any filtered output. */
4505 make_cleanup (finish_thread_state_cleanup
, &minus_one_ptid
);
4506 else if (last
.kind
!= TARGET_WAITKIND_SIGNALLED
4507 && last
.kind
!= TARGET_WAITKIND_EXITED
)
4508 make_cleanup (finish_thread_state_cleanup
, &inferior_ptid
);
4510 /* In non-stop mode, we don't want GDB to switch threads behind the
4511 user's back, to avoid races where the user is typing a command to
4512 apply to thread x, but GDB switches to thread y before the user
4513 finishes entering the command. */
4515 /* As with the notification of thread events, we want to delay
4516 notifying the user that we've switched thread context until
4517 the inferior actually stops.
4519 There's no point in saying anything if the inferior has exited.
4520 Note that SIGNALLED here means "exited with a signal", not
4521 "received a signal". */
4523 && !ptid_equal (previous_inferior_ptid
, inferior_ptid
)
4524 && target_has_execution
4525 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
4526 && last
.kind
!= TARGET_WAITKIND_EXITED
)
4528 target_terminal_ours_for_output ();
4529 printf_filtered (_("[Switching to %s]\n"),
4530 target_pid_to_str (inferior_ptid
));
4531 annotate_thread_changed ();
4532 previous_inferior_ptid
= inferior_ptid
;
4535 if (!breakpoints_always_inserted_mode () && target_has_execution
)
4537 if (remove_breakpoints ())
4539 target_terminal_ours_for_output ();
4540 printf_filtered (_("\
4541 Cannot remove breakpoints because program is no longer writable.\n\
4542 Further execution is probably impossible.\n"));
4546 /* If an auto-display called a function and that got a signal,
4547 delete that auto-display to avoid an infinite recursion. */
4549 if (stopped_by_random_signal
)
4550 disable_current_display ();
4552 /* Don't print a message if in the middle of doing a "step n"
4553 operation for n > 1 */
4554 if (target_has_execution
4555 && last
.kind
!= TARGET_WAITKIND_SIGNALLED
4556 && last
.kind
!= TARGET_WAITKIND_EXITED
4557 && inferior_thread ()->step_multi
4558 && inferior_thread ()->stop_step
)
4561 target_terminal_ours ();
4563 /* Set the current source location. This will also happen if we
4564 display the frame below, but the current SAL will be incorrect
4565 during a user hook-stop function. */
4566 if (has_stack_frames () && !stop_stack_dummy
)
4567 set_current_sal_from_frame (get_current_frame (), 1);
4569 /* Let the user/frontend see the threads as stopped. */
4570 do_cleanups (old_chain
);
4572 /* Look up the hook_stop and run it (CLI internally handles problem
4573 of stop_command's pre-hook not existing). */
4575 catch_errors (hook_stop_stub
, stop_command
,
4576 "Error while running hook_stop:\n", RETURN_MASK_ALL
);
4578 if (!has_stack_frames ())
4581 if (last
.kind
== TARGET_WAITKIND_SIGNALLED
4582 || last
.kind
== TARGET_WAITKIND_EXITED
)
4585 /* Select innermost stack frame - i.e., current frame is frame 0,
4586 and current location is based on that.
4587 Don't do this on return from a stack dummy routine,
4588 or if the program has exited. */
4590 if (!stop_stack_dummy
)
4592 select_frame (get_current_frame ());
4594 /* Print current location without a level number, if
4595 we have changed functions or hit a breakpoint.
4596 Print source line if we have one.
4597 bpstat_print() contains the logic deciding in detail
4598 what to print, based on the event(s) that just occurred. */
4600 /* If --batch-silent is enabled then there's no need to print the current
4601 source location, and to try risks causing an error message about
4602 missing source files. */
4603 if (stop_print_frame
&& !batch_silent
)
4607 int do_frame_printing
= 1;
4608 struct thread_info
*tp
= inferior_thread ();
4610 bpstat_ret
= bpstat_print (tp
->stop_bpstat
);
4614 /* If we had hit a shared library event breakpoint,
4615 bpstat_print would print out this message. If we hit
4616 an OS-level shared library event, do the same
4618 if (last
.kind
== TARGET_WAITKIND_LOADED
)
4620 printf_filtered (_("Stopped due to shared library event\n"));
4621 source_flag
= SRC_LINE
; /* something bogus */
4622 do_frame_printing
= 0;
4626 /* FIXME: cagney/2002-12-01: Given that a frame ID does
4627 (or should) carry around the function and does (or
4628 should) use that when doing a frame comparison. */
4630 && frame_id_eq (tp
->step_frame_id
,
4631 get_frame_id (get_current_frame ()))
4632 && step_start_function
== find_pc_function (stop_pc
))
4633 source_flag
= SRC_LINE
; /* finished step, just print source line */
4635 source_flag
= SRC_AND_LOC
; /* print location and source line */
4637 case PRINT_SRC_AND_LOC
:
4638 source_flag
= SRC_AND_LOC
; /* print location and source line */
4640 case PRINT_SRC_ONLY
:
4641 source_flag
= SRC_LINE
;
4644 source_flag
= SRC_LINE
; /* something bogus */
4645 do_frame_printing
= 0;
4648 internal_error (__FILE__
, __LINE__
, _("Unknown value."));
4651 /* The behavior of this routine with respect to the source
4653 SRC_LINE: Print only source line
4654 LOCATION: Print only location
4655 SRC_AND_LOC: Print location and source line */
4656 if (do_frame_printing
)
4657 print_stack_frame (get_selected_frame (NULL
), 0, source_flag
);
4659 /* Display the auto-display expressions. */
4664 /* Save the function value return registers, if we care.
4665 We might be about to restore their previous contents. */
4666 if (inferior_thread ()->proceed_to_finish
)
4668 /* This should not be necessary. */
4670 regcache_xfree (stop_registers
);
4672 /* NB: The copy goes through to the target picking up the value of
4673 all the registers. */
4674 stop_registers
= regcache_dup (get_current_regcache ());
4677 if (stop_stack_dummy
)
4679 /* Pop the empty frame that contains the stack dummy.
4680 This also restores inferior state prior to the call
4681 (struct inferior_thread_state). */
4682 struct frame_info
*frame
= get_current_frame ();
4683 gdb_assert (get_frame_type (frame
) == DUMMY_FRAME
);
4685 /* frame_pop() calls reinit_frame_cache as the last thing it does
4686 which means there's currently no selected frame. We don't need
4687 to re-establish a selected frame if the dummy call returns normally,
4688 that will be done by restore_inferior_status. However, we do have
4689 to handle the case where the dummy call is returning after being
4690 stopped (e.g. the dummy call previously hit a breakpoint). We
4691 can't know which case we have so just always re-establish a
4692 selected frame here. */
4693 select_frame (get_current_frame ());
4697 annotate_stopped ();
4699 /* Suppress the stop observer if we're in the middle of:
4701 - a step n (n > 1), as there still more steps to be done.
4703 - a "finish" command, as the observer will be called in
4704 finish_command_continuation, so it can include the inferior
4705 function's return value.
4707 - calling an inferior function, as we pretend we inferior didn't
4708 run at all. The return value of the call is handled by the
4709 expression evaluator, through call_function_by_hand. */
4711 if (!target_has_execution
4712 || last
.kind
== TARGET_WAITKIND_SIGNALLED
4713 || last
.kind
== TARGET_WAITKIND_EXITED
4714 || (!inferior_thread ()->step_multi
4715 && !(inferior_thread ()->stop_bpstat
4716 && inferior_thread ()->proceed_to_finish
)
4717 && !inferior_thread ()->in_infcall
))
4719 if (!ptid_equal (inferior_ptid
, null_ptid
))
4720 observer_notify_normal_stop (inferior_thread ()->stop_bpstat
,
4723 observer_notify_normal_stop (NULL
, stop_print_frame
);
4726 if (target_has_execution
)
4728 if (last
.kind
!= TARGET_WAITKIND_SIGNALLED
4729 && last
.kind
!= TARGET_WAITKIND_EXITED
)
4730 /* Delete the breakpoint we stopped at, if it wants to be deleted.
4731 Delete any breakpoint that is to be deleted at the next stop. */
4732 breakpoint_auto_delete (inferior_thread ()->stop_bpstat
);
4737 hook_stop_stub (void *cmd
)
4739 execute_cmd_pre_hook ((struct cmd_list_element
*) cmd
);
4744 signal_stop_state (int signo
)
4746 return signal_stop
[signo
];
4750 signal_print_state (int signo
)
4752 return signal_print
[signo
];
4756 signal_pass_state (int signo
)
4758 return signal_program
[signo
];
4762 signal_stop_update (int signo
, int state
)
4764 int ret
= signal_stop
[signo
];
4765 signal_stop
[signo
] = state
;
4770 signal_print_update (int signo
, int state
)
4772 int ret
= signal_print
[signo
];
4773 signal_print
[signo
] = state
;
4778 signal_pass_update (int signo
, int state
)
4780 int ret
= signal_program
[signo
];
4781 signal_program
[signo
] = state
;
4786 sig_print_header (void)
4788 printf_filtered (_("\
4789 Signal Stop\tPrint\tPass to program\tDescription\n"));
4793 sig_print_info (enum target_signal oursig
)
4795 const char *name
= target_signal_to_name (oursig
);
4796 int name_padding
= 13 - strlen (name
);
4798 if (name_padding
<= 0)
4801 printf_filtered ("%s", name
);
4802 printf_filtered ("%*.*s ", name_padding
, name_padding
, " ");
4803 printf_filtered ("%s\t", signal_stop
[oursig
] ? "Yes" : "No");
4804 printf_filtered ("%s\t", signal_print
[oursig
] ? "Yes" : "No");
4805 printf_filtered ("%s\t\t", signal_program
[oursig
] ? "Yes" : "No");
4806 printf_filtered ("%s\n", target_signal_to_string (oursig
));
4809 /* Specify how various signals in the inferior should be handled. */
4812 handle_command (char *args
, int from_tty
)
4815 int digits
, wordlen
;
4816 int sigfirst
, signum
, siglast
;
4817 enum target_signal oursig
;
4820 unsigned char *sigs
;
4821 struct cleanup
*old_chain
;
4825 error_no_arg (_("signal to handle"));
4828 /* Allocate and zero an array of flags for which signals to handle. */
4830 nsigs
= (int) TARGET_SIGNAL_LAST
;
4831 sigs
= (unsigned char *) alloca (nsigs
);
4832 memset (sigs
, 0, nsigs
);
4834 /* Break the command line up into args. */
4836 argv
= gdb_buildargv (args
);
4837 old_chain
= make_cleanup_freeargv (argv
);
4839 /* Walk through the args, looking for signal oursigs, signal names, and
4840 actions. Signal numbers and signal names may be interspersed with
4841 actions, with the actions being performed for all signals cumulatively
4842 specified. Signal ranges can be specified as <LOW>-<HIGH>. */
4844 while (*argv
!= NULL
)
4846 wordlen
= strlen (*argv
);
4847 for (digits
= 0; isdigit ((*argv
)[digits
]); digits
++)
4851 sigfirst
= siglast
= -1;
4853 if (wordlen
>= 1 && !strncmp (*argv
, "all", wordlen
))
4855 /* Apply action to all signals except those used by the
4856 debugger. Silently skip those. */
4859 siglast
= nsigs
- 1;
4861 else if (wordlen
>= 1 && !strncmp (*argv
, "stop", wordlen
))
4863 SET_SIGS (nsigs
, sigs
, signal_stop
);
4864 SET_SIGS (nsigs
, sigs
, signal_print
);
4866 else if (wordlen
>= 1 && !strncmp (*argv
, "ignore", wordlen
))
4868 UNSET_SIGS (nsigs
, sigs
, signal_program
);
4870 else if (wordlen
>= 2 && !strncmp (*argv
, "print", wordlen
))
4872 SET_SIGS (nsigs
, sigs
, signal_print
);
4874 else if (wordlen
>= 2 && !strncmp (*argv
, "pass", wordlen
))
4876 SET_SIGS (nsigs
, sigs
, signal_program
);
4878 else if (wordlen
>= 3 && !strncmp (*argv
, "nostop", wordlen
))
4880 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
4882 else if (wordlen
>= 3 && !strncmp (*argv
, "noignore", wordlen
))
4884 SET_SIGS (nsigs
, sigs
, signal_program
);
4886 else if (wordlen
>= 4 && !strncmp (*argv
, "noprint", wordlen
))
4888 UNSET_SIGS (nsigs
, sigs
, signal_print
);
4889 UNSET_SIGS (nsigs
, sigs
, signal_stop
);
4891 else if (wordlen
>= 4 && !strncmp (*argv
, "nopass", wordlen
))
4893 UNSET_SIGS (nsigs
, sigs
, signal_program
);
4895 else if (digits
> 0)
4897 /* It is numeric. The numeric signal refers to our own
4898 internal signal numbering from target.h, not to host/target
4899 signal number. This is a feature; users really should be
4900 using symbolic names anyway, and the common ones like
4901 SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
4903 sigfirst
= siglast
= (int)
4904 target_signal_from_command (atoi (*argv
));
4905 if ((*argv
)[digits
] == '-')
4908 target_signal_from_command (atoi ((*argv
) + digits
+ 1));
4910 if (sigfirst
> siglast
)
4912 /* Bet he didn't figure we'd think of this case... */
4920 oursig
= target_signal_from_name (*argv
);
4921 if (oursig
!= TARGET_SIGNAL_UNKNOWN
)
4923 sigfirst
= siglast
= (int) oursig
;
4927 /* Not a number and not a recognized flag word => complain. */
4928 error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv
);
4932 /* If any signal numbers or symbol names were found, set flags for
4933 which signals to apply actions to. */
4935 for (signum
= sigfirst
; signum
>= 0 && signum
<= siglast
; signum
++)
4937 switch ((enum target_signal
) signum
)
4939 case TARGET_SIGNAL_TRAP
:
4940 case TARGET_SIGNAL_INT
:
4941 if (!allsigs
&& !sigs
[signum
])
4943 if (query (_("%s is used by the debugger.\n\
4944 Are you sure you want to change it? "), target_signal_to_name ((enum target_signal
) signum
)))
4950 printf_unfiltered (_("Not confirmed, unchanged.\n"));
4951 gdb_flush (gdb_stdout
);
4955 case TARGET_SIGNAL_0
:
4956 case TARGET_SIGNAL_DEFAULT
:
4957 case TARGET_SIGNAL_UNKNOWN
:
4958 /* Make sure that "all" doesn't print these. */
4969 for (signum
= 0; signum
< nsigs
; signum
++)
4972 target_notice_signals (inferior_ptid
);
4976 /* Show the results. */
4977 sig_print_header ();
4978 for (; signum
< nsigs
; signum
++)
4980 sig_print_info (signum
);
4986 do_cleanups (old_chain
);
4990 xdb_handle_command (char *args
, int from_tty
)
4993 struct cleanup
*old_chain
;
4996 error_no_arg (_("xdb command"));
4998 /* Break the command line up into args. */
5000 argv
= gdb_buildargv (args
);
5001 old_chain
= make_cleanup_freeargv (argv
);
5002 if (argv
[1] != (char *) NULL
)
5007 bufLen
= strlen (argv
[0]) + 20;
5008 argBuf
= (char *) xmalloc (bufLen
);
5012 enum target_signal oursig
;
5014 oursig
= target_signal_from_name (argv
[0]);
5015 memset (argBuf
, 0, bufLen
);
5016 if (strcmp (argv
[1], "Q") == 0)
5017 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
5020 if (strcmp (argv
[1], "s") == 0)
5022 if (!signal_stop
[oursig
])
5023 sprintf (argBuf
, "%s %s", argv
[0], "stop");
5025 sprintf (argBuf
, "%s %s", argv
[0], "nostop");
5027 else if (strcmp (argv
[1], "i") == 0)
5029 if (!signal_program
[oursig
])
5030 sprintf (argBuf
, "%s %s", argv
[0], "pass");
5032 sprintf (argBuf
, "%s %s", argv
[0], "nopass");
5034 else if (strcmp (argv
[1], "r") == 0)
5036 if (!signal_print
[oursig
])
5037 sprintf (argBuf
, "%s %s", argv
[0], "print");
5039 sprintf (argBuf
, "%s %s", argv
[0], "noprint");
5045 handle_command (argBuf
, from_tty
);
5047 printf_filtered (_("Invalid signal handling flag.\n"));
5052 do_cleanups (old_chain
);
5055 /* Print current contents of the tables set by the handle command.
5056 It is possible we should just be printing signals actually used
5057 by the current target (but for things to work right when switching
5058 targets, all signals should be in the signal tables). */
5061 signals_info (char *signum_exp
, int from_tty
)
5063 enum target_signal oursig
;
5064 sig_print_header ();
5068 /* First see if this is a symbol name. */
5069 oursig
= target_signal_from_name (signum_exp
);
5070 if (oursig
== TARGET_SIGNAL_UNKNOWN
)
5072 /* No, try numeric. */
5074 target_signal_from_command (parse_and_eval_long (signum_exp
));
5076 sig_print_info (oursig
);
5080 printf_filtered ("\n");
5081 /* These ugly casts brought to you by the native VAX compiler. */
5082 for (oursig
= TARGET_SIGNAL_FIRST
;
5083 (int) oursig
< (int) TARGET_SIGNAL_LAST
;
5084 oursig
= (enum target_signal
) ((int) oursig
+ 1))
5088 if (oursig
!= TARGET_SIGNAL_UNKNOWN
5089 && oursig
!= TARGET_SIGNAL_DEFAULT
&& oursig
!= TARGET_SIGNAL_0
)
5090 sig_print_info (oursig
);
5093 printf_filtered (_("\nUse the \"handle\" command to change these tables.\n"));
5096 /* The $_siginfo convenience variable is a bit special. We don't know
5097 for sure the type of the value until we actually have a chance to
5098 fetch the data. The type can change depending on gdbarch, so it it
5099 also dependent on which thread you have selected.
5101 1. making $_siginfo be an internalvar that creates a new value on
5104 2. making the value of $_siginfo be an lval_computed value. */
5106 /* This function implements the lval_computed support for reading a
5110 siginfo_value_read (struct value
*v
)
5112 LONGEST transferred
;
5115 target_read (¤t_target
, TARGET_OBJECT_SIGNAL_INFO
,
5117 value_contents_all_raw (v
),
5119 TYPE_LENGTH (value_type (v
)));
5121 if (transferred
!= TYPE_LENGTH (value_type (v
)))
5122 error (_("Unable to read siginfo"));
5125 /* This function implements the lval_computed support for writing a
5129 siginfo_value_write (struct value
*v
, struct value
*fromval
)
5131 LONGEST transferred
;
5133 transferred
= target_write (¤t_target
,
5134 TARGET_OBJECT_SIGNAL_INFO
,
5136 value_contents_all_raw (fromval
),
5138 TYPE_LENGTH (value_type (fromval
)));
5140 if (transferred
!= TYPE_LENGTH (value_type (fromval
)))
5141 error (_("Unable to write siginfo"));
5144 static struct lval_funcs siginfo_value_funcs
=
5150 /* Return a new value with the correct type for the siginfo object of
5151 the current thread. Return a void value if there's no object
5154 static struct value
*
5155 siginfo_make_value (struct internalvar
*var
)
5158 struct gdbarch
*gdbarch
;
5160 if (target_has_stack
5161 && !ptid_equal (inferior_ptid
, null_ptid
))
5163 gdbarch
= get_frame_arch (get_current_frame ());
5165 if (gdbarch_get_siginfo_type_p (gdbarch
))
5167 type
= gdbarch_get_siginfo_type (gdbarch
);
5169 return allocate_computed_value (type
, &siginfo_value_funcs
, NULL
);
5173 return allocate_value (builtin_type_void
);
5177 /* Inferior thread state.
5178 These are details related to the inferior itself, and don't include
5179 things like what frame the user had selected or what gdb was doing
5180 with the target at the time.
5181 For inferior function calls these are things we want to restore
5182 regardless of whether the function call successfully completes
5183 or the dummy frame has to be manually popped. */
5185 struct inferior_thread_state
5187 enum target_signal stop_signal
;
5189 struct regcache
*registers
;
5192 struct inferior_thread_state
*
5193 save_inferior_thread_state (void)
5195 struct inferior_thread_state
*inf_state
= XMALLOC (struct inferior_thread_state
);
5196 struct thread_info
*tp
= inferior_thread ();
5198 inf_state
->stop_signal
= tp
->stop_signal
;
5199 inf_state
->stop_pc
= stop_pc
;
5201 inf_state
->registers
= regcache_dup (get_current_regcache ());
5206 /* Restore inferior session state to INF_STATE. */
5209 restore_inferior_thread_state (struct inferior_thread_state
*inf_state
)
5211 struct thread_info
*tp
= inferior_thread ();
5213 tp
->stop_signal
= inf_state
->stop_signal
;
5214 stop_pc
= inf_state
->stop_pc
;
5216 /* The inferior can be gone if the user types "print exit(0)"
5217 (and perhaps other times). */
5218 if (target_has_execution
)
5219 /* NB: The register write goes through to the target. */
5220 regcache_cpy (get_current_regcache (), inf_state
->registers
);
5221 regcache_xfree (inf_state
->registers
);
5226 do_restore_inferior_thread_state_cleanup (void *state
)
5228 restore_inferior_thread_state (state
);
5232 make_cleanup_restore_inferior_thread_state (struct inferior_thread_state
*inf_state
)
5234 return make_cleanup (do_restore_inferior_thread_state_cleanup
, inf_state
);
5238 discard_inferior_thread_state (struct inferior_thread_state
*inf_state
)
5240 regcache_xfree (inf_state
->registers
);
5245 get_inferior_thread_state_regcache (struct inferior_thread_state
*inf_state
)
5247 return inf_state
->registers
;
5250 /* Session related state for inferior function calls.
5251 These are the additional bits of state that need to be restored
5252 when an inferior function call successfully completes. */
5254 struct inferior_status
5258 int stop_stack_dummy
;
5259 int stopped_by_random_signal
;
5260 int stepping_over_breakpoint
;
5261 CORE_ADDR step_range_start
;
5262 CORE_ADDR step_range_end
;
5263 struct frame_id step_frame_id
;
5264 enum step_over_calls_kind step_over_calls
;
5265 CORE_ADDR step_resume_break_address
;
5266 int stop_after_trap
;
5269 /* ID if the selected frame when the inferior function call was made. */
5270 struct frame_id selected_frame_id
;
5272 int proceed_to_finish
;
5276 /* Save all of the information associated with the inferior<==>gdb
5279 struct inferior_status
*
5280 save_inferior_status (void)
5282 struct inferior_status
*inf_status
= XMALLOC (struct inferior_status
);
5283 struct thread_info
*tp
= inferior_thread ();
5284 struct inferior
*inf
= current_inferior ();
5286 inf_status
->stop_step
= tp
->stop_step
;
5287 inf_status
->stop_stack_dummy
= stop_stack_dummy
;
5288 inf_status
->stopped_by_random_signal
= stopped_by_random_signal
;
5289 inf_status
->stepping_over_breakpoint
= tp
->trap_expected
;
5290 inf_status
->step_range_start
= tp
->step_range_start
;
5291 inf_status
->step_range_end
= tp
->step_range_end
;
5292 inf_status
->step_frame_id
= tp
->step_frame_id
;
5293 inf_status
->step_over_calls
= tp
->step_over_calls
;
5294 inf_status
->stop_after_trap
= stop_after_trap
;
5295 inf_status
->stop_soon
= inf
->stop_soon
;
5296 /* Save original bpstat chain here; replace it with copy of chain.
5297 If caller's caller is walking the chain, they'll be happier if we
5298 hand them back the original chain when restore_inferior_status is
5300 inf_status
->stop_bpstat
= tp
->stop_bpstat
;
5301 tp
->stop_bpstat
= bpstat_copy (tp
->stop_bpstat
);
5302 inf_status
->proceed_to_finish
= tp
->proceed_to_finish
;
5303 inf_status
->in_infcall
= tp
->in_infcall
;
5305 inf_status
->selected_frame_id
= get_frame_id (get_selected_frame (NULL
));
5311 restore_selected_frame (void *args
)
5313 struct frame_id
*fid
= (struct frame_id
*) args
;
5314 struct frame_info
*frame
;
5316 frame
= frame_find_by_id (*fid
);
5318 /* If inf_status->selected_frame_id is NULL, there was no previously
5322 warning (_("Unable to restore previously selected frame."));
5326 select_frame (frame
);
5331 /* Restore inferior session state to INF_STATUS. */
5334 restore_inferior_status (struct inferior_status
*inf_status
)
5336 struct thread_info
*tp
= inferior_thread ();
5337 struct inferior
*inf
= current_inferior ();
5339 tp
->stop_step
= inf_status
->stop_step
;
5340 stop_stack_dummy
= inf_status
->stop_stack_dummy
;
5341 stopped_by_random_signal
= inf_status
->stopped_by_random_signal
;
5342 tp
->trap_expected
= inf_status
->stepping_over_breakpoint
;
5343 tp
->step_range_start
= inf_status
->step_range_start
;
5344 tp
->step_range_end
= inf_status
->step_range_end
;
5345 tp
->step_frame_id
= inf_status
->step_frame_id
;
5346 tp
->step_over_calls
= inf_status
->step_over_calls
;
5347 stop_after_trap
= inf_status
->stop_after_trap
;
5348 inf
->stop_soon
= inf_status
->stop_soon
;
5349 bpstat_clear (&tp
->stop_bpstat
);
5350 tp
->stop_bpstat
= inf_status
->stop_bpstat
;
5351 inf_status
->stop_bpstat
= NULL
;
5352 tp
->proceed_to_finish
= inf_status
->proceed_to_finish
;
5353 tp
->in_infcall
= inf_status
->in_infcall
;
5355 if (target_has_stack
)
5357 /* The point of catch_errors is that if the stack is clobbered,
5358 walking the stack might encounter a garbage pointer and
5359 error() trying to dereference it. */
5361 (restore_selected_frame
, &inf_status
->selected_frame_id
,
5362 "Unable to restore previously selected frame:\n",
5363 RETURN_MASK_ERROR
) == 0)
5364 /* Error in restoring the selected frame. Select the innermost
5366 select_frame (get_current_frame ());
5373 do_restore_inferior_status_cleanup (void *sts
)
5375 restore_inferior_status (sts
);
5379 make_cleanup_restore_inferior_status (struct inferior_status
*inf_status
)
5381 return make_cleanup (do_restore_inferior_status_cleanup
, inf_status
);
5385 discard_inferior_status (struct inferior_status
*inf_status
)
5387 /* See save_inferior_status for info on stop_bpstat. */
5388 bpstat_clear (&inf_status
->stop_bpstat
);
5393 inferior_has_forked (ptid_t pid
, ptid_t
*child_pid
)
5395 struct target_waitstatus last
;
5398 get_last_target_status (&last_ptid
, &last
);
5400 if (last
.kind
!= TARGET_WAITKIND_FORKED
)
5403 if (!ptid_equal (last_ptid
, pid
))
5406 *child_pid
= last
.value
.related_pid
;
5411 inferior_has_vforked (ptid_t pid
, ptid_t
*child_pid
)
5413 struct target_waitstatus last
;
5416 get_last_target_status (&last_ptid
, &last
);
5418 if (last
.kind
!= TARGET_WAITKIND_VFORKED
)
5421 if (!ptid_equal (last_ptid
, pid
))
5424 *child_pid
= last
.value
.related_pid
;
5429 inferior_has_execd (ptid_t pid
, char **execd_pathname
)
5431 struct target_waitstatus last
;
5434 get_last_target_status (&last_ptid
, &last
);
5436 if (last
.kind
!= TARGET_WAITKIND_EXECD
)
5439 if (!ptid_equal (last_ptid
, pid
))
5442 *execd_pathname
= xstrdup (last
.value
.execd_pathname
);
5446 /* Oft used ptids */
5448 ptid_t minus_one_ptid
;
5450 /* Create a ptid given the necessary PID, LWP, and TID components. */
5453 ptid_build (int pid
, long lwp
, long tid
)
5463 /* Create a ptid from just a pid. */
5466 pid_to_ptid (int pid
)
5468 return ptid_build (pid
, 0, 0);
5471 /* Fetch the pid (process id) component from a ptid. */
5474 ptid_get_pid (ptid_t ptid
)
5479 /* Fetch the lwp (lightweight process) component from a ptid. */
5482 ptid_get_lwp (ptid_t ptid
)
5487 /* Fetch the tid (thread id) component from a ptid. */
5490 ptid_get_tid (ptid_t ptid
)
5495 /* ptid_equal() is used to test equality of two ptids. */
5498 ptid_equal (ptid_t ptid1
, ptid_t ptid2
)
5500 return (ptid1
.pid
== ptid2
.pid
&& ptid1
.lwp
== ptid2
.lwp
5501 && ptid1
.tid
== ptid2
.tid
);
5504 /* Returns true if PTID represents a process. */
5507 ptid_is_pid (ptid_t ptid
)
5509 if (ptid_equal (minus_one_ptid
, ptid
))
5511 if (ptid_equal (null_ptid
, ptid
))
5514 return (ptid_get_lwp (ptid
) == 0 && ptid_get_tid (ptid
) == 0);
5517 /* restore_inferior_ptid() will be used by the cleanup machinery
5518 to restore the inferior_ptid value saved in a call to
5519 save_inferior_ptid(). */
5522 restore_inferior_ptid (void *arg
)
5524 ptid_t
*saved_ptid_ptr
= arg
;
5525 inferior_ptid
= *saved_ptid_ptr
;
5529 /* Save the value of inferior_ptid so that it may be restored by a
5530 later call to do_cleanups(). Returns the struct cleanup pointer
5531 needed for later doing the cleanup. */
5534 save_inferior_ptid (void)
5536 ptid_t
*saved_ptid_ptr
;
5538 saved_ptid_ptr
= xmalloc (sizeof (ptid_t
));
5539 *saved_ptid_ptr
= inferior_ptid
;
5540 return make_cleanup (restore_inferior_ptid
, saved_ptid_ptr
);
5544 /* User interface for reverse debugging:
5545 Set exec-direction / show exec-direction commands
5546 (returns error unless target implements to_set_exec_direction method). */
5548 enum exec_direction_kind execution_direction
= EXEC_FORWARD
;
5549 static const char exec_forward
[] = "forward";
5550 static const char exec_reverse
[] = "reverse";
5551 static const char *exec_direction
= exec_forward
;
5552 static const char *exec_direction_names
[] = {
5559 set_exec_direction_func (char *args
, int from_tty
,
5560 struct cmd_list_element
*cmd
)
5562 if (target_can_execute_reverse
)
5564 if (!strcmp (exec_direction
, exec_forward
))
5565 execution_direction
= EXEC_FORWARD
;
5566 else if (!strcmp (exec_direction
, exec_reverse
))
5567 execution_direction
= EXEC_REVERSE
;
5572 show_exec_direction_func (struct ui_file
*out
, int from_tty
,
5573 struct cmd_list_element
*cmd
, const char *value
)
5575 switch (execution_direction
) {
5577 fprintf_filtered (out
, _("Forward.\n"));
5580 fprintf_filtered (out
, _("Reverse.\n"));
5584 fprintf_filtered (out
,
5585 _("Forward (target `%s' does not support exec-direction).\n"),
5591 /* User interface for non-stop mode. */
5594 static int non_stop_1
= 0;
5597 set_non_stop (char *args
, int from_tty
,
5598 struct cmd_list_element
*c
)
5600 if (target_has_execution
)
5602 non_stop_1
= non_stop
;
5603 error (_("Cannot change this setting while the inferior is running."));
5606 non_stop
= non_stop_1
;
5610 show_non_stop (struct ui_file
*file
, int from_tty
,
5611 struct cmd_list_element
*c
, const char *value
)
5613 fprintf_filtered (file
,
5614 _("Controlling the inferior in non-stop mode is %s.\n"),
5619 show_schedule_multiple (struct ui_file
*file
, int from_tty
,
5620 struct cmd_list_element
*c
, const char *value
)
5622 fprintf_filtered (file
, _("\
5623 Resuming the execution of threads of all processes is %s.\n"), value
);
5627 _initialize_infrun (void)
5631 struct cmd_list_element
*c
;
5633 add_info ("signals", signals_info
, _("\
5634 What debugger does when program gets various signals.\n\
5635 Specify a signal as argument to print info on that signal only."));
5636 add_info_alias ("handle", "signals", 0);
5638 add_com ("handle", class_run
, handle_command
, _("\
5639 Specify how to handle a signal.\n\
5640 Args are signals and actions to apply to those signals.\n\
5641 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
5642 from 1-15 are allowed for compatibility with old versions of GDB.\n\
5643 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
5644 The special arg \"all\" is recognized to mean all signals except those\n\
5645 used by the debugger, typically SIGTRAP and SIGINT.\n\
5646 Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
5647 \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
5648 Stop means reenter debugger if this signal happens (implies print).\n\
5649 Print means print a message if this signal happens.\n\
5650 Pass means let program see this signal; otherwise program doesn't know.\n\
5651 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
5652 Pass and Stop may be combined."));
5655 add_com ("lz", class_info
, signals_info
, _("\
5656 What debugger does when program gets various signals.\n\
5657 Specify a signal as argument to print info on that signal only."));
5658 add_com ("z", class_run
, xdb_handle_command
, _("\
5659 Specify how to handle a signal.\n\
5660 Args are signals and actions to apply to those signals.\n\
5661 Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
5662 from 1-15 are allowed for compatibility with old versions of GDB.\n\
5663 Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
5664 The special arg \"all\" is recognized to mean all signals except those\n\
5665 used by the debugger, typically SIGTRAP and SIGINT.\n\
5666 Recognized actions include \"s\" (toggles between stop and nostop), \n\
5667 \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \
5668 nopass), \"Q\" (noprint)\n\
5669 Stop means reenter debugger if this signal happens (implies print).\n\
5670 Print means print a message if this signal happens.\n\
5671 Pass means let program see this signal; otherwise program doesn't know.\n\
5672 Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
5673 Pass and Stop may be combined."));
5677 stop_command
= add_cmd ("stop", class_obscure
,
5678 not_just_help_class_command
, _("\
5679 There is no `stop' command, but you can set a hook on `stop'.\n\
5680 This allows you to set a list of commands to be run each time execution\n\
5681 of the program stops."), &cmdlist
);
5683 add_setshow_zinteger_cmd ("infrun", class_maintenance
, &debug_infrun
, _("\
5684 Set inferior debugging."), _("\
5685 Show inferior debugging."), _("\
5686 When non-zero, inferior specific debugging is enabled."),
5689 &setdebuglist
, &showdebuglist
);
5691 add_setshow_boolean_cmd ("displaced", class_maintenance
, &debug_displaced
, _("\
5692 Set displaced stepping debugging."), _("\
5693 Show displaced stepping debugging."), _("\
5694 When non-zero, displaced stepping specific debugging is enabled."),
5696 show_debug_displaced
,
5697 &setdebuglist
, &showdebuglist
);
5699 add_setshow_boolean_cmd ("non-stop", no_class
,
5701 Set whether gdb controls the inferior in non-stop mode."), _("\
5702 Show whether gdb controls the inferior in non-stop mode."), _("\
5703 When debugging a multi-threaded program and this setting is\n\
5704 off (the default, also called all-stop mode), when one thread stops\n\
5705 (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\
5706 all other threads in the program while you interact with the thread of\n\
5707 interest. When you continue or step a thread, you can allow the other\n\
5708 threads to run, or have them remain stopped, but while you inspect any\n\
5709 thread's state, all threads stop.\n\
5711 In non-stop mode, when one thread stops, other threads can continue\n\
5712 to run freely. You'll be able to step each thread independently,\n\
5713 leave it stopped or free to run as needed."),
5719 numsigs
= (int) TARGET_SIGNAL_LAST
;
5720 signal_stop
= (unsigned char *) xmalloc (sizeof (signal_stop
[0]) * numsigs
);
5721 signal_print
= (unsigned char *)
5722 xmalloc (sizeof (signal_print
[0]) * numsigs
);
5723 signal_program
= (unsigned char *)
5724 xmalloc (sizeof (signal_program
[0]) * numsigs
);
5725 for (i
= 0; i
< numsigs
; i
++)
5728 signal_print
[i
] = 1;
5729 signal_program
[i
] = 1;
5732 /* Signals caused by debugger's own actions
5733 should not be given to the program afterwards. */
5734 signal_program
[TARGET_SIGNAL_TRAP
] = 0;
5735 signal_program
[TARGET_SIGNAL_INT
] = 0;
5737 /* Signals that are not errors should not normally enter the debugger. */
5738 signal_stop
[TARGET_SIGNAL_ALRM
] = 0;
5739 signal_print
[TARGET_SIGNAL_ALRM
] = 0;
5740 signal_stop
[TARGET_SIGNAL_VTALRM
] = 0;
5741 signal_print
[TARGET_SIGNAL_VTALRM
] = 0;
5742 signal_stop
[TARGET_SIGNAL_PROF
] = 0;
5743 signal_print
[TARGET_SIGNAL_PROF
] = 0;
5744 signal_stop
[TARGET_SIGNAL_CHLD
] = 0;
5745 signal_print
[TARGET_SIGNAL_CHLD
] = 0;
5746 signal_stop
[TARGET_SIGNAL_IO
] = 0;
5747 signal_print
[TARGET_SIGNAL_IO
] = 0;
5748 signal_stop
[TARGET_SIGNAL_POLL
] = 0;
5749 signal_print
[TARGET_SIGNAL_POLL
] = 0;
5750 signal_stop
[TARGET_SIGNAL_URG
] = 0;
5751 signal_print
[TARGET_SIGNAL_URG
] = 0;
5752 signal_stop
[TARGET_SIGNAL_WINCH
] = 0;
5753 signal_print
[TARGET_SIGNAL_WINCH
] = 0;
5755 /* These signals are used internally by user-level thread
5756 implementations. (See signal(5) on Solaris.) Like the above
5757 signals, a healthy program receives and handles them as part of
5758 its normal operation. */
5759 signal_stop
[TARGET_SIGNAL_LWP
] = 0;
5760 signal_print
[TARGET_SIGNAL_LWP
] = 0;
5761 signal_stop
[TARGET_SIGNAL_WAITING
] = 0;
5762 signal_print
[TARGET_SIGNAL_WAITING
] = 0;
5763 signal_stop
[TARGET_SIGNAL_CANCEL
] = 0;
5764 signal_print
[TARGET_SIGNAL_CANCEL
] = 0;
5766 add_setshow_zinteger_cmd ("stop-on-solib-events", class_support
,
5767 &stop_on_solib_events
, _("\
5768 Set stopping for shared library events."), _("\
5769 Show stopping for shared library events."), _("\
5770 If nonzero, gdb will give control to the user when the dynamic linker\n\
5771 notifies gdb of shared library events. The most common event of interest\n\
5772 to the user would be loading/unloading of a new library."),
5774 show_stop_on_solib_events
,
5775 &setlist
, &showlist
);
5777 add_setshow_enum_cmd ("follow-fork-mode", class_run
,
5778 follow_fork_mode_kind_names
,
5779 &follow_fork_mode_string
, _("\
5780 Set debugger response to a program call of fork or vfork."), _("\
5781 Show debugger response to a program call of fork or vfork."), _("\
5782 A fork or vfork creates a new process. follow-fork-mode can be:\n\
5783 parent - the original process is debugged after a fork\n\
5784 child - the new process is debugged after a fork\n\
5785 The unfollowed process will continue to run.\n\
5786 By default, the debugger will follow the parent process."),
5788 show_follow_fork_mode_string
,
5789 &setlist
, &showlist
);
5791 add_setshow_enum_cmd ("scheduler-locking", class_run
,
5792 scheduler_enums
, &scheduler_mode
, _("\
5793 Set mode for locking scheduler during execution."), _("\
5794 Show mode for locking scheduler during execution."), _("\
5795 off == no locking (threads may preempt at any time)\n\
5796 on == full locking (no thread except the current thread may run)\n\
5797 step == scheduler locked during every single-step operation.\n\
5798 In this mode, no other thread may run during a step command.\n\
5799 Other threads may run while stepping over a function call ('next')."),
5800 set_schedlock_func
, /* traps on target vector */
5801 show_scheduler_mode
,
5802 &setlist
, &showlist
);
5804 add_setshow_boolean_cmd ("schedule-multiple", class_run
, &sched_multi
, _("\
5805 Set mode for resuming threads of all processes."), _("\
5806 Show mode for resuming threads of all processes."), _("\
5807 When on, execution commands (such as 'continue' or 'next') resume all\n\
5808 threads of all processes. When off (which is the default), execution\n\
5809 commands only resume the threads of the current process. The set of\n\
5810 threads that are resumed is further refined by the scheduler-locking\n\
5811 mode (see help set scheduler-locking)."),
5813 show_schedule_multiple
,
5814 &setlist
, &showlist
);
5816 add_setshow_boolean_cmd ("step-mode", class_run
, &step_stop_if_no_debug
, _("\
5817 Set mode of the step operation."), _("\
5818 Show mode of the step operation."), _("\
5819 When set, doing a step over a function without debug line information\n\
5820 will stop at the first instruction of that function. Otherwise, the\n\
5821 function is skipped and the step command stops at a different source line."),
5823 show_step_stop_if_no_debug
,
5824 &setlist
, &showlist
);
5826 add_setshow_enum_cmd ("displaced-stepping", class_run
,
5827 can_use_displaced_stepping_enum
,
5828 &can_use_displaced_stepping
, _("\
5829 Set debugger's willingness to use displaced stepping."), _("\
5830 Show debugger's willingness to use displaced stepping."), _("\
5831 If on, gdb will use displaced stepping to step over breakpoints if it is\n\
5832 supported by the target architecture. If off, gdb will not use displaced\n\
5833 stepping to step over breakpoints, even if such is supported by the target\n\
5834 architecture. If auto (which is the default), gdb will use displaced stepping\n\
5835 if the target architecture supports it and non-stop mode is active, but will not\n\
5836 use it in all-stop mode (see help set non-stop)."),
5838 show_can_use_displaced_stepping
,
5839 &setlist
, &showlist
);
5841 add_setshow_enum_cmd ("exec-direction", class_run
, exec_direction_names
,
5842 &exec_direction
, _("Set direction of execution.\n\
5843 Options are 'forward' or 'reverse'."),
5844 _("Show direction of execution (forward/reverse)."),
5845 _("Tells gdb whether to execute forward or backward."),
5846 set_exec_direction_func
, show_exec_direction_func
,
5847 &setlist
, &showlist
);
5849 /* ptid initializations */
5850 null_ptid
= ptid_build (0, 0, 0);
5851 minus_one_ptid
= ptid_build (-1, 0, 0);
5852 inferior_ptid
= null_ptid
;
5853 target_last_wait_ptid
= minus_one_ptid
;
5854 displaced_step_ptid
= null_ptid
;
5856 observer_attach_thread_ptid_changed (infrun_thread_ptid_changed
);
5857 observer_attach_thread_stop_requested (infrun_thread_stop_requested
);
5858 observer_attach_thread_exit (infrun_thread_thread_exit
);
5860 /* Explicitly create without lookup, since that tries to create a
5861 value with a void typed value, and when we get here, gdbarch
5862 isn't initialized yet. At this point, we're quite sure there
5863 isn't another convenience variable of the same name. */
5864 create_internalvar_type_lazy ("_siginfo", siginfo_make_value
);